# FREE Gizmos

## Get access to a rotating collection of free Gizmos chosen from our library of over 500 math and science labs and simulations. Sign up today to start teaching with these online STEM tools!

See How FREE Gizmos WorkDisease Spread

- Updated!

FREE *with no time limit!*

Observe the spread of disease through a group of people. The methods of transmission can be chosen and include person-to-person, airborne, and foodborne as well as any combination thereof....

Lesson Info Launch GizmoCrumple Zones

- New!

FREE *with no time limit!*

Design a car to protect a test dummy in a collision. Adjust the length and stiffness of the crumple zone and the rigidity of the safety cell to determine how the car will deform during the...

Lesson Info Launch GizmoFraction Artist 2 (Area Models of Fractions)

FREE *with no time limit!*

Extend understanding of fractions by making modern paintings in the style of Piet Mondrian. Create and analyze paintings with different-sized sections. Compare the sizes of unit fractions....

Lesson Info Launch GizmoCritter Count (Modeling Multiplication)

FREE *with no time limit!*

Use groups of critters on leaves to model multiplication as repeated addition. Change the expression to change the number of groups or the number of critters per group. Display the...

Lesson Info Launch GizmoQuilting Bee (Symmetry)

FREE *with no time limit!*

Participate in an old-fashioned quilting bee and create a colorful, symmetrical quilt. Quilts can be created with a vertical, horizontal, or diagonal line of symmetry. Quilts can be folded...

Lesson Info Launch GizmoCargo Captain (Multi-digit Subtraction)

FREE *with no time limit!*

You are the captain of an interplanetary cargo ship, delivering important supplies to the outer planets. The cargo can be stored in barrels, crates, and holds. (There are 10 barrels in a...

Lesson Info Launch GizmoRoad Trip (Problem Solving)

FREE *with no time limit!*

Plan a cross-country road trip through various U.S. state capitals. First choose a vehicle to drive, and then fill up the tank with gas and go! Find the range and gas mileage of each...

Lesson Info Launch GizmoGrowing Plants

- Updated!

FREE *with no time limit!*

Investigate the growth of three common garden plants: tomatoes, beans, and turnips. You can change the amount of light each plant gets, the amount of water added each day, and the type of...

Lesson Info Launch GizmoBuilding Pangaea

FREE *with no time limit!*

In 1915, Alfred Wegener proposed that all of Earth's continents were once joined in an ancient supercontinent he called Pangaea. Wegener's idea of moving continents led to the modern theory...

Lesson Info Launch GizmoOcean Tides

FREE *with no time limit!*

Develop an understanding of ocean tides by comparing the depth of water near a dock to the positions of the Moon, Sun, and Earth. Determine the influence of the Moon and Sun on tides, and...

Lesson Info Launch GizmoInheritance

FREE *with no time limit!*

Create aliens with different traits and breed them to produce offspring. Determine which traits are passed down from parents to offspring and which traits are acquired. Offspring can be...

Lesson Info Launch GizmoAnimal Group Behavior

- Stem Case

*Video Preview*

A farmer in Africa is having problems with elephants eating her corn and cotton crops. As a wildlife biologist, students learn about animal group behavior and relationships of elephants and...

Lesson InfoSlope

FREE *with no time limit!*

Explore the slope of a line, and learn how to calculate slope. Adjust the line by moving points that are on the line, and see how its slope changes.

Lesson Info Launch GizmoSquare Roots

FREE *with no time limit!*

Explore the meaning of square roots using an area model. Use the side length of a square to find the square root of a decimal number or a whole number.

Lesson Info Launch GizmoBox-and-Whisker Plots

FREE *with no time limit!*

Construct a box-and-whisker plot to match a line plots, and construct a line plot to match a box-and-whisker plots. Manipulate the line plot and examine how the box-and-whisker plot...

Lesson Info Launch GizmoArea of Triangles

FREE *with no time limit!*

Use a dynamic triangle to explore the area of a triangle. With the help of an animation, see that any triangle is always half of a parallelogram (with the same base and height). Likewise, a...

Lesson Info Launch GizmoNumber Systems

FREE *with no time limit!*

Explore number systems and convert numbers from one base to another using counter beads in place-value columns.

Lesson Info Launch GizmoMovie Reviewer (Mean and Median)

FREE *with no time limit!*

Movie reviewers rate movies on a scale of 0 to 10. Each movie comes with a set of reviews that can be changed by the user. The mean of a data set can be explored using a see-saw balance...

Lesson Info Launch GizmoDisease Spread

- Updated!

FREE *with no time limit!*

Observe the spread of disease through a group of people. The methods of transmission can be chosen and include person-to-person, airborne, and foodborne as well as any combination thereof....

Lesson Info Launch GizmoCell Division

FREE *with no time limit!*

Begin with a single cell and watch as mitosis and cell division occurs. The cells will go through the steps of interphase, prophase, metaphase, anaphase, telophase, and cytokinesis. The...

Lesson Info Launch GizmoPhase Changes

FREE *with no time limit!*

Explore the relationship between molecular motion, temperature, and phase changes. Compare the molecular structure of solids, liquids, and gases. Graph temperature changes as ice is melted...

Lesson Info Launch GizmoEyes and Vision 2 - Focusing Light

- New!

FREE *with no time limit!*

Once light enters the eye, it must be focused on the retina. Manipulate the pupil diameter to regulate the amount of light that enters then eye, then change the lens shape to focus light....

Lesson Info Launch GizmoEllipses

FREE *with no time limit!*

Compare the equation of an ellipse to its graph. Vary the terms of the equation of the ellipse and examine how the graph changes in response. Drag the vertices and foci, explore their...

Lesson Info Launch GizmoLinear Programming

FREE *with no time limit!*

Use the graph of the feasible region to find the maximum or minimum value of the objective function. Vary the coefficients of the objective function and vary the constraints. Explore how...

Lesson Info Launch GizmoTranslating and Scaling Functions

FREE *with no time limit!*

Vary the coefficients in the equation of a function and examine how the graph of the function is translated or scaled. Select different functions to translate and scale, and determine what...

Lesson Info Launch GizmoBiconditional Statements

FREE *with no time limit!*

Make a biconditional statement from a given definition using word tiles. Use both symbolic form and standard English form.

Lesson Info Launch GizmoPopulations and Samples

FREE *with no time limit!*

Compare sample distributions drawn from population distributions. Predict characteristics of a population distribution based on a sample distribution and examine how well a small sample...

Lesson Info Launch GizmoHalf-life

FREE *with no time limit!*

Investigate the decay of a radioactive substance. The half-life and the number of radioactive atoms can be adjusted, and theoretical or random decay can be observed. Data can be interpreted...

Lesson Info Launch GizmoMouse Genetics (Two Traits)

FREE *with no time limit!*

Breed "pure" mice with known genotypes that exhibit specific fur and eye colors, and learn how traits are passed on via dominant and recessive genes. Mice can be stored in cages for future...

Lesson Info Launch GizmoDrug Dosage

FREE *with no time limit!*

A drug prescription must be carefully planned to maximize benefit while avoiding an overdose. In this Gizmo, you can give a patient one or more pills and monitor the levels of medication in...

Lesson Info Launch GizmoRay Tracing (Lenses)

FREE *with no time limit!*

Observe light rays that pass through a convex or concave lens. Manipulate the position of an object and the focal length of the lens and measure the distance and size of the resulting image.

Lesson Info Launch GizmoRay Tracing (Mirrors)

FREE *with no time limit!*

Observe light rays that reflect from a convex or concave mirror. Manipulate the position of an object and the focal length of the mirror and measure the distance and size of the resulting...

Lesson Info Launch GizmoFast Plants^{®} 1 - Growth and Genetics

- New!

FREE *with no time limit!*

Grow Wisconsin Fast Plants® in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating...

Lesson Info Launch GizmoFast Plants^{®} 2 - Mystery Parent

- New!

FREE *with no time limit!*

In this follow-up to Fast Plants® 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast...

Lesson Info Launch GizmoMeowsis

- Stem Case

*Video Preview*

As a geneticist in an animal hospital, students learn about genetic changes in meiosis to determine the reason why a male cat can have calico fur coloring.

Lesson InfoNo Alien Left Behind (Division with Remainders)

FREE *with no time limit!*

The alien school children from the planet Zigmo travel to distant planets on a field trip. The goal is to select a bus size so that all buses are full and no aliens are left behind. This...

Lesson Info Launch GizmoFraction Garden (Comparing Fractions)

FREE *with no time limit!*

Plant flowers in two gardens to help develop fraction sense. The two gardens act as number lines, from 0 to 1. Use the flowers in the gardens to compare fractions and to explore equivalent...

Lesson Info Launch GizmoModeling Decimals (Area and Grid Models)

FREE *with no time limit!*

Model and compare decimals using area models. Set the number of sections in each model to 1, 10, or 100, and then click in the models to shade sections. Compare decimals visually and on a...

Lesson Info Launch GizmoBalancing Blocks (Volume)

FREE *with no time limit!*

This Gizmo provides you with two challenges. First, use blocks to build a figure with a given volume. Then, try to balance the blocks on a platform that sits on the tip of a cone. The...

Lesson Info Launch GizmoFactor Trees (Factoring Numbers)

FREE *with no time limit!*

The Factor Trees Gizmo has two modes. In Factor mode, you can create factor trees to factor composite numbers into primes. In Build mode, you can build numbers by multiplying primes...

Lesson Info Launch GizmoPattern Flip (Patterns)

FREE *with no time limit!*

In the Pattern Flip carnival game, you are shown a pattern of cards. The first cards are face-up so you can see the pattern, and the rest are face-down. Can you guess which animals are on...

Lesson Info Launch GizmoFlower Pollination

FREE *with no time limit!*

Observe the steps of pollination and fertilization in flowering plants. Help with many parts of the process by dragging pollen grains to the stigma, dragging sperm to the ovules, and...

Lesson Info Launch GizmoMineral Identification

FREE *with no time limit!*

Observe and measure the properties of a mineral sample, and then use a key to identify the mineral. Students can observe the color, luster, shape, density, hardness, streak, and reaction to...

Lesson Info Launch GizmoAnts on a Slant (Inclined Plane)

FREE *with no time limit!*

Lift food using ants with the help of a slanted stick. The steepness of the stick, the number of ants, and the size of the item being lifted can be varied. Observe the effect of friction on...

Lesson Info Launch GizmoProgrammable Rover

- New!

FREE *with no time limit!*

In this introduction to coding, program a rover to explore the surface of Mars. Start by using tiles to create simple programs involving moving forward or backward, turns, jumps, loops, and...

Lesson Info Launch GizmoCorrelation

FREE *with no time limit!*

Explore the relationship between the correlation coefficient of a data set and its graph. Fit a line to the data and compare the least-squares fit line.

Lesson Info Launch GizmoRational Numbers, Opposites, and Absolute Values

FREE *with no time limit!*

Use a number line to compare rational numbers. Change values by dragging points on the number line. Compare the opposites and absolute values of the numbers.

Lesson Info Launch GizmoPercent of Change

FREE *with no time limit!*

Apply markups and discounts using interactive "percent rulers." Improve number sense for percents with this dynamic, visual tool. Reinforce the original cost (or original price) as the...

Lesson Info Launch GizmoPolling: Neighborhood

FREE *with no time limit!*

Conduct a phone poll of citizens in a small neighborhood to determine their response to a yes-or-no question. Use the results to estimate the sentiment of the entire population. Investigate...

Lesson Info Launch GizmoFunction Machines 3 (Functions and Problem Solving)

FREE *with no time limit!*

Drop a number into a function machine, and see what number comes out! You can use one of the six pre-set function machines, or program your own function rule into one of the blank machines....

Lesson Info Launch GizmoSimplifying Algebraic Expressions II

FREE *with no time limit!*

Will you adopt Spidro, Centeon, or Ping Bee? They're three very different critters with one thing in common: a hunger for simplified algebraic expressions! Learn how the distributive...

Lesson Info Launch GizmoNatural Selection

FREE *with no time limit!*

You are a bird hunting moths (both dark and light) that live on trees. As you capture the moths most easily visible against the tree surface, the moth populations change, illustrating the...

Lesson Info Launch GizmoRadiation

FREE *with no time limit!*

Use a powerful flashlight to pop a kernel of popcorn. A lens focuses light on the kernel. The temperature of the filament and the distance between the flashlight and lens can be changed....

Lesson Info Launch GizmoMeasuring Volume

FREE *with no time limit!*

Measure the volume of liquids and solids using beakers, graduated cylinders, overflow cups, and rulers. Water can be poured from one container to another and objects can be added to...

Lesson Info Launch GizmoWeathering

FREE *with no time limit!*

Weathering is the breakdown of rock at Earth's surface through physical or chemical means. Students will learn about the different types of mechanical and chemical weathering, then use a...

Lesson Info Launch GizmoModeling the Factorization of *x*^{2}+*bx*+*c*

FREE *with no time limit!*

Factor a polynomial with a leading coefficient equal to 1 using an area model. Use step-by-step feedback to diagnose any mistakes.

Lesson Info Launch GizmoGeneral Form of a Rational Function

FREE *with no time limit!*

Compare the equation of a rational function to its graph. Multiply or divide the numerator and denominator by linear factors and explore how the graph changes in response.

Lesson Info Launch GizmoAbsolute Value Equations and Inequalities

FREE *with no time limit!*

Solve an inequality involving absolute values using a graph of the absolute-value function. Vary the terms of the absolute-value function and vary the value that you are comparing it to. ...

Lesson Info Launch GizmoLinear Inequalities in Two Variables

FREE *with no time limit!*

Find the solution set to a linear inequality in two variables using the graph of the linear inequality. Vary the terms of the inequality and vary the inequality symbol. Examine how the...

Lesson Info Launch GizmoPolygon Angle Sum

FREE *with no time limit!*

Derive the sum of the angles of a polygon by dividing the polygon into triangles and summing their angles. Vary the number of sides and determine how the sum of the angles changes. Dilate...

Lesson Info Launch GizmoSurface and Lateral Areas of Prisms and Cylinders

FREE *with no time limit!*

Vary the dimensions of a prism or cylinder and investigate how the surface area changes. Use the dynamic net of the solid to compute the lateral area and the surface area of the solid.

Lesson Info Launch GizmoBuilding DNA

FREE *with no time limit!*

Construct a DNA molecule, examine its double-helix structure, and then go through the DNA replication process. Learn how each component fits into a DNA molecule, and see how a unique,...

Lesson Info Launch GizmoIonic Bonds

FREE *with no time limit!*

Simulate ionic bonds between a variety of metals and nonmetals. Select a metal and a nonmetal atom, and transfer electrons from one to the other. Observe the effect of gaining and losing...

Lesson Info Launch GizmoCrumple Zones

- New!

FREE *with no time limit!*

Design a car to protect a test dummy in a collision. Adjust the length and stiffness of the crumple zone and the rigidity of the safety cell to determine how the car will deform during the...

Lesson Info Launch GizmoFast Plants^{®} 1 - Growth and Genetics

- New!

FREE *with no time limit!*

Grow Wisconsin Fast Plants® in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating...

Lesson Info Launch GizmoFast Plants^{®} 2 - Mystery Parent

- New!

FREE *with no time limit!*

In this follow-up to Fast Plants® 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast...

Lesson Info Launch GizmoOcean Carbon Equilibrium

- Stem Case

*Video Preview*

Mussel farmers in the Arctic Ocean have reported problems with their mussels. They have noticed that the mussel shells have eroded and become brittle. Students take on the role of a marine...

Lesson InfoHow Free Gizmos Work

Start teaching with
**20-40 Free Gizmos**. See the full list.

Access **lesson materials** for Free Gizmos including teacher guides, lesson plans, and more.

All other Gizmos are limited to a **5 Minute Preview** and can only be used for 5 minutes a day.

**Free Gizmos change each semester.** The new collection will be available Jan 01, 2023.

About STEM Cases

Students assume the role of a scientist trying to solve a real world problem. They use scientific practices to collect and analyze data, and form and test a hypothesis as they solve the problems.

Each STEM Case uses realtime reporting to show live student results.

Introduction to the Heatmap

STEM Cases take between 30-90 minutes for students to complete, depending on the case.

Student progress is automatically saved so that STEM Cases can be completed over multiple sessions.

Multiple grade-appropriate versions, or levels, exist for each STEM Case.

Each STEM Case level has an associated Handbook. These are interactive guides that focus on the science concepts underlying the case.

Disease Spread

- Updated!

FREE *with no time limit!*

Observe the spread of disease through a group of people. The methods of transmission can be chosen and include person-to-person, airborne, and foodborne as well as any combination thereof. The probability of each form of transmission and number of people in the group can also be adjusted.

Lesson Info Launch GizmoCrumple Zones

- New!

FREE *with no time limit!*

Design a car to protect a test dummy in a collision. Adjust the length and stiffness of the crumple zone and the rigidity of the safety cell to determine how the car will deform during the crash. Add seat belts and/or airbags to prevent the dummy from hitting the steering wheel. Three different body types (sedan, SUV, and subcompact) are available and a wide range of crash speeds can be used.

Lesson Info Launch GizmoFraction Artist 2 (Area Models of Fractions)

FREE *with no time limit!*

Extend understanding of fractions by making modern paintings in the style of Piet Mondrian. Create and analyze paintings with different-sized sections. Compare the sizes of unit fractions. Find creative ways to color one-half of a painting. This can be a nice introduction to adding fractions with unlike denominators.

Lesson Info Launch GizmoCritter Count (Modeling Multiplication)

FREE *with no time limit!*

Use groups of critters on leaves to model multiplication as repeated addition. Change the expression to change the number of groups or the number of critters per group. Display the critters either on leaves or as a rectangular array.

Lesson Info Launch GizmoQuilting Bee (Symmetry)

FREE *with no time limit!*

Participate in an old-fashioned quilting bee and create a colorful, symmetrical quilt. Quilts can be created with a vertical, horizontal, or diagonal line of symmetry. Quilts can be folded to look for reflections, or rotated to test for rotational symmetry.

Lesson Info Launch GizmoCargo Captain (Multi-digit Subtraction)

FREE *with no time limit!*

You are the captain of an interplanetary cargo ship, delivering important supplies to the outer planets. The cargo can be stored in barrels, crates, and holds. (There are 10 barrels in a crate, and 10 crates in a hold.) Model multi-digit subtraction by unloading cargo on each planet.

Lesson Info Launch GizmoRoad Trip (Problem Solving)

FREE *with no time limit!*

Plan a cross-country road trip through various U.S. state capitals. First choose a vehicle to drive, and then fill up the tank with gas and go! Find the range and gas mileage of each vehicle, and discover the shortest path between two cities.

Lesson Info Launch GizmoGrowing Plants

- Updated!

FREE *with no time limit!*

Investigate the growth of three common garden plants: tomatoes, beans, and turnips. You can change the amount of light each plant gets, the amount of water added each day, and the type of soil the seed is planted in. Observe the effect of each variable on plant height, plant mass, leaf color and leaf size. Determine what conditions produce the tallest and healthiest plants. Height and mass data are displayed on tables and graphs.

Lesson Info Launch GizmoBuilding Pangaea

FREE *with no time limit!*

In 1915, Alfred Wegener proposed that all of Earth's continents were once joined in an ancient supercontinent he called Pangaea. Wegener's idea of moving continents led to the modern theory of plate tectonics. Create your own version of Pangaea by fitting Earth's landmasses together like puzzle pieces. Use evidence from fossils, rocks, and glaciers to refine your map.

Lesson Info Launch GizmoOcean Tides

FREE *with no time limit!*

Develop an understanding of ocean tides by comparing the depth of water near a dock to the positions of the Moon, Sun, and Earth. Determine the influence of the Moon and Sun on tides, and compare spring tides to neap tides.

Lesson Info Launch GizmoInheritance

FREE *with no time limit!*

Create aliens with different traits and breed them to produce offspring. Determine which traits are passed down from parents to offspring and which traits are acquired. Offspring can be stored for future experiments or released.

Lesson Info Launch GizmoAnimal Group Behavior

- Stem Case

*Video Preview*

A farmer in Africa is having problems with elephants eating her corn and cotton crops. As a wildlife biologist, students learn about animal group behavior and relationships of elephants and humans with bees. Students collect data from the farm and elephants to hypothesize and test solutions that will protect the crops without hurting the elephants.

Lesson InfoSlope

FREE *with no time limit!*

Explore the slope of a line, and learn how to calculate slope. Adjust the line by moving points that are on the line, and see how its slope changes.

Lesson Info Launch GizmoSquare Roots

FREE *with no time limit!*

Explore the meaning of square roots using an area model. Use the side length of a square to find the square root of a decimal number or a whole number.

Lesson Info Launch GizmoBox-and-Whisker Plots

FREE *with no time limit!*

Construct a box-and-whisker plot to match a line plots, and construct a line plot to match a box-and-whisker plots. Manipulate the line plot and examine how the box-and-whisker plot changes. Then manipulate the box-and-whisker plot and examine how the line plot changes.

Lesson Info Launch GizmoArea of Triangles

FREE *with no time limit!*

Use a dynamic triangle to explore the area of a triangle. With the help of an animation, see that any triangle is always half of a parallelogram (with the same base and height). Likewise, a similar animation shows the connection between parallelograms and rectangles.

Lesson Info Launch GizmoNumber Systems

FREE *with no time limit!*

Explore number systems and convert numbers from one base to another using counter beads in place-value columns.

Lesson Info Launch GizmoMovie Reviewer (Mean and Median)

FREE *with no time limit!*

Movie reviewers rate movies on a scale of 0 to 10. Each movie comes with a set of reviews that can be changed by the user. The mean of a data set can be explored using a see-saw balance model. Students can also find the median, mode, and range of the data set.

Lesson Info Launch GizmoDisease Spread

- Updated!

FREE *with no time limit!*

Observe the spread of disease through a group of people. The methods of transmission can be chosen and include person-to-person, airborne, and foodborne as well as any combination thereof. The probability of each form of transmission and number of people in the group can also be adjusted.

Lesson Info Launch GizmoCell Division

FREE *with no time limit!*

Begin with a single cell and watch as mitosis and cell division occurs. The cells will go through the steps of interphase, prophase, metaphase, anaphase, telophase, and cytokinesis. The length of the cell cycle can be controlled, and data related to the number of cells present and their current phase can be recorded.

Lesson Info Launch GizmoPhase Changes

FREE *with no time limit!*

Explore the relationship between molecular motion, temperature, and phase changes. Compare the molecular structure of solids, liquids, and gases. Graph temperature changes as ice is melted and water is boiled. Find the effect of altitude on phase changes. The starting temperature, ice volume, altitude, and rate of heating or cooling can be adjusted.

Lesson Info Launch GizmoEyes and Vision 2 - Focusing Light

- New!

FREE *with no time limit!*

Once light enters the eye, it must be focused on the retina. Manipulate the pupil diameter to regulate the amount of light that enters then eye, then change the lens shape to focus light. Determine the changes in lens shape needed to maintain focus as the object distance changes. This is a followup to the Eyes and Vision 1 - Seeing Colors lesson.

Lesson Info Launch GizmoEllipses

FREE *with no time limit!*

Compare the equation of an ellipse to its graph. Vary the terms of the equation of the ellipse and examine how the graph changes in response. Drag the vertices and foci, explore their Pythagorean relationship, and discover the string property.

Lesson Info Launch GizmoLinear Programming

FREE *with no time limit!*

Use the graph of the feasible region to find the maximum or minimum value of the objective function. Vary the coefficients of the objective function and vary the constraints. Explore how the graph of the feasible region changes in response.

Lesson Info Launch GizmoTranslating and Scaling Functions

FREE *with no time limit!*

Vary the coefficients in the equation of a function and examine how the graph of the function is translated or scaled. Select different functions to translate and scale, and determine what they have in common.

Lesson Info Launch GizmoBiconditional Statements

FREE *with no time limit!*

Make a biconditional statement from a given definition using word tiles. Use both symbolic form and standard English form.

Lesson Info Launch GizmoPopulations and Samples

FREE *with no time limit!*

Compare sample distributions drawn from population distributions. Predict characteristics of a population distribution based on a sample distribution and examine how well a small sample represents a given population.

Lesson Info Launch GizmoHalf-life

FREE *with no time limit!*

Investigate the decay of a radioactive substance. The half-life and the number of radioactive atoms can be adjusted, and theoretical or random decay can be observed. Data can be interpreted visually using a dynamic graph, a bar chart, and a table. Determine the half-lives of two sample isotopes as well as samples with randomly generated half-lives.

Lesson Info Launch GizmoMouse Genetics (Two Traits)

FREE *with no time limit!*

Breed "pure" mice with known genotypes that exhibit specific fur and eye colors, and learn how traits are passed on via dominant and recessive genes. Mice can be stored in cages for future breeding, and the statistics of fur and eye color are reported every time a pair of mice breed. Punnett squares can be used to predict results.

Lesson Info Launch GizmoDrug Dosage

FREE *with no time limit!*

A drug prescription must be carefully planned to maximize benefit while avoiding an overdose. In this Gizmo, you can give a patient one or more pills and monitor the levels of medication in the body through time. Based on the reaction of the patient, determine the ideal levels of medication. Create a dosage schedule so these levels are maintained through time. Four types of pills, each with a different release pattern and target organ, are available for use.

Lesson Info Launch GizmoRay Tracing (Lenses)

FREE *with no time limit!*

Observe light rays that pass through a convex or concave lens. Manipulate the position of an object and the focal length of the lens and measure the distance and size of the resulting image.

Lesson Info Launch GizmoRay Tracing (Mirrors)

FREE *with no time limit!*

Observe light rays that reflect from a convex or concave mirror. Manipulate the position of an object and the focal length of the mirror and measure the distance and size of the resulting image.

Lesson Info Launch GizmoFast Plants^{®} 1 - Growth and Genetics

- New!

FREE *with no time limit!*

Grow Wisconsin Fast Plants^{®} in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating the plants using bee sticks, then observe the traits of the offspring plants. Use Punnett squares to model the inheritance of genes for stem color and leaf color for these plants.

Fast Plants^{®} 2 - Mystery Parent

- New!

FREE *with no time limit!*

In this follow-up to Fast Plants^{®} 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast Plants based on the traits of the P1, F1, and F2 plants. Then create designer Fast Plants by selectively breeding plants with desired traits.

Meowsis

- Stem Case

*Video Preview*

As a geneticist in an animal hospital, students learn about genetic changes in meiosis to determine the reason why a male cat can have calico fur coloring.

Lesson InfoNo Alien Left Behind (Division with Remainders)

FREE *with no time limit!*

The alien school children from the planet Zigmo travel to distant planets on a field trip. The goal is to select a bus size so that all buses are full and no aliens are left behind. This is a nice illustration of division with remainders.

Lesson Info Launch GizmoFraction Garden (Comparing Fractions)

FREE *with no time limit!*

Plant flowers in two gardens to help develop fraction sense. The two gardens act as number lines, from 0 to 1. Use the flowers in the gardens to compare fractions and to explore equivalent fractions. Chalk marks can be drawn to divide the garden into equal sections.

Lesson Info Launch GizmoModeling Decimals (Area and Grid Models)

FREE *with no time limit!*

Model and compare decimals using area models. Set the number of sections in each model to 1, 10, or 100, and then click in the models to shade sections. Compare decimals visually and on a number line.

Lesson Info Launch GizmoBalancing Blocks (Volume)

FREE *with no time limit!*

This Gizmo provides you with two challenges. First, use blocks to build a figure with a given volume. Then, try to balance the blocks on a platform that sits on the tip of a cone. The dimensions of the platform can be adjusted, and blocks can be added or deleted by clicking on the model.

Lesson Info Launch GizmoFactor Trees (Factoring Numbers)

FREE *with no time limit!*

The Factor Trees Gizmo has two modes. In Factor mode, you can create factor trees to factor composite numbers into primes. In Build mode, you can build numbers by multiplying primes together. Can you build all composite numbers up to 50? Any whole composite number up to 999 can be factored or built with the Gizmo.

Lesson Info Launch GizmoPattern Flip (Patterns)

FREE *with no time limit!*

In the Pattern Flip carnival game, you are shown a pattern of cards. The first cards are face-up so you can see the pattern, and the rest are face-down. Can you guess which animals are on the face-down cards? Use one of the preset patterns, or make your own custom pattern. Good luck!

Lesson Info Launch GizmoFlower Pollination

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Observe the steps of pollination and fertilization in flowering plants. Help with many parts of the process by dragging pollen grains to the stigma, dragging sperm to the ovules, and removing petals as the fruit begins to grow. Quiz yourself when you are done by dragging vocabulary words to the correct plant structure.

Lesson Info Launch GizmoMineral Identification

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Observe and measure the properties of a mineral sample, and then use a key to identify the mineral. Students can observe the color, luster, shape, density, hardness, streak, and reaction to acid for each mineral. There are 26 mineral samples to identify.

Lesson Info Launch GizmoAnts on a Slant (Inclined Plane)

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Lift food using ants with the help of a slanted stick. The steepness of the stick, the number of ants, and the size of the item being lifted can be varied. Observe the effect of friction on sliding objects.

Lesson Info Launch GizmoProgrammable Rover

- New!

FREE *with no time limit!*

In this introduction to coding, program a rover to explore the surface of Mars. Start by using tiles to create simple programs involving moving forward or backward, turns, jumps, loops, and picking up rock samples. Then use text instructions to optimize your code. Use your skills to program the rover to complete six challenging missions on Mars.

Lesson Info Launch GizmoCorrelation

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Explore the relationship between the correlation coefficient of a data set and its graph. Fit a line to the data and compare the least-squares fit line.

Lesson Info Launch GizmoRational Numbers, Opposites, and Absolute Values

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Use a number line to compare rational numbers. Change values by dragging points on the number line. Compare the opposites and absolute values of the numbers.

Lesson Info Launch GizmoPercent of Change

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Apply markups and discounts using interactive "percent rulers." Improve number sense for percents with this dynamic, visual tool. Reinforce the original cost (or original price) as the baseline for percent calculations.

Lesson Info Launch GizmoPolling: Neighborhood

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Conduct a phone poll of citizens in a small neighborhood to determine their response to a yes-or-no question. Use the results to estimate the sentiment of the entire population. Investigate how the error of this estimate becomes smaller as more people are polled. Compare random versus non-random sampling.

Lesson Info Launch GizmoFunction Machines 3 (Functions and Problem Solving)

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Drop a number into a function machine, and see what number comes out! You can use one of the six pre-set function machines, or program your own function rule into one of the blank machines. Stack up to three function machines together. Input and output can be recorded in a table and on a graph.

Lesson Info Launch GizmoSimplifying Algebraic Expressions II

FREE *with no time limit!*

Will you adopt Spidro, Centeon, or Ping Bee? They're three very different critters with one thing in common: a hunger for simplified algebraic expressions! Learn how the distributive property can be used to combine variable terms, producing expressions that will help your pet grow up healthy and strong. You'll become a pro at identifying terms that can be combined – even terms with exponents and multiple variables. With enough practice, you and your pet will be ready for the competitive expression eating circuit. Good luck!

Lesson Info Launch GizmoNatural Selection

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You are a bird hunting moths (both dark and light) that live on trees. As you capture the moths most easily visible against the tree surface, the moth populations change, illustrating the effects of natural selection.

Lesson Info Launch GizmoRadiation

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Use a powerful flashlight to pop a kernel of popcorn. A lens focuses light on the kernel. The temperature of the filament and the distance between the flashlight and lens can be changed. Several obstacles can be placed between the flashlight and the popcorn.

Lesson Info Launch GizmoMeasuring Volume

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Measure the volume of liquids and solids using beakers, graduated cylinders, overflow cups, and rulers. Water can be poured from one container to another and objects can be added to containers. A pipette can be used to transfer small amounts of water, and a magnifier can be used to observe the meniscus in a graduated cylinder. Test your volume-measurement skills in the "Practice" mode of the Gizmo.

Lesson Info Launch GizmoWeathering

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Weathering is the breakdown of rock at Earth's surface through physical or chemical means. Students will learn about the different types of mechanical and chemical weathering, then use a simulation to model the effects of weathering on different types of rocks in varying climate conditions.

Lesson Info Launch GizmoModeling the Factorization of *x*^{2}+*bx*+*c*

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Factor a polynomial with a leading coefficient equal to 1 using an area model. Use step-by-step feedback to diagnose any mistakes.

Lesson Info Launch GizmoGeneral Form of a Rational Function

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Compare the equation of a rational function to its graph. Multiply or divide the numerator and denominator by linear factors and explore how the graph changes in response.

Lesson Info Launch GizmoAbsolute Value Equations and Inequalities

FREE *with no time limit!*

Solve an inequality involving absolute values using a graph of the absolute-value function. Vary the terms of the absolute-value function and vary the value that you are comparing it to. Then explore how the graph and solution set change in response.

Lesson Info Launch GizmoLinear Inequalities in Two Variables

FREE *with no time limit!*

Find the solution set to a linear inequality in two variables using the graph of the linear inequality. Vary the terms of the inequality and vary the inequality symbol. Examine how the boundary line and shaded region change in response.

Lesson Info Launch GizmoPolygon Angle Sum

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Derive the sum of the angles of a polygon by dividing the polygon into triangles and summing their angles. Vary the number of sides and determine how the sum of the angles changes. Dilate the polygon to see that the sum is unchanged.

Lesson Info Launch GizmoSurface and Lateral Areas of Prisms and Cylinders

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Vary the dimensions of a prism or cylinder and investigate how the surface area changes. Use the dynamic net of the solid to compute the lateral area and the surface area of the solid.

Lesson Info Launch GizmoBuilding DNA

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Construct a DNA molecule, examine its double-helix structure, and then go through the DNA replication process. Learn how each component fits into a DNA molecule, and see how a unique, self-replicating code can be created.

Lesson Info Launch GizmoIonic Bonds

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Simulate ionic bonds between a variety of metals and nonmetals. Select a metal and a nonmetal atom, and transfer electrons from one to the other. Observe the effect of gaining and losing electrons on charge, and rearrange the atoms to represent the molecular structure. Additional metal and nonmetal atoms can be added to the screen, and the resulting chemical formula can be displayed.

Lesson Info Launch GizmoCrumple Zones

- New!

FREE *with no time limit!*

Design a car to protect a test dummy in a collision. Adjust the length and stiffness of the crumple zone and the rigidity of the safety cell to determine how the car will deform during the crash. Add seat belts and/or airbags to prevent the dummy from hitting the steering wheel. Three different body types (sedan, SUV, and subcompact) are available and a wide range of crash speeds can be used.

Lesson Info Launch GizmoFast Plants^{®} 1 - Growth and Genetics

- New!

FREE *with no time limit!*

Grow Wisconsin Fast Plants^{®} in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating the plants using bee sticks, then observe the traits of the offspring plants. Use Punnett squares to model the inheritance of genes for stem color and leaf color for these plants.

Fast Plants^{®} 2 - Mystery Parent

- New!

FREE *with no time limit!*

In this follow-up to Fast Plants^{®} 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast Plants based on the traits of the P1, F1, and F2 plants. Then create designer Fast Plants by selectively breeding plants with desired traits.

Ocean Carbon Equilibrium

- Stem Case

*Video Preview*

Mussel farmers in the Arctic Ocean have reported problems with their mussels. They have noticed that the mussel shells have eroded and become brittle. Students take on the role of a marine chemist to analyze the changes to ocean carbon chemistry and equilibrium to determine the cause of the mussel shell erosion.

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