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# 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 WorkModeling Fractions (Area Models)

FREE *with no time limit!*

Model and compare fractions using area models. Set the denominators with the arrow buttons, and then set the numerators with the arrow buttons or by clicking in the models. Compare...

Lesson Info Launch GizmoChocomatic (Multiplication, Arrays, and Area)

FREE *with no time limit!*

Use the Chocomatic to design candy bars made out of chocolate squares. Use multiplication to find the number of squares in each chocolate bar. Build collections of chocolate bars that all...

Lesson Info Launch GizmoAdding Whole Numbers and Decimals (Base-10 Blocks)

FREE *with no time limit!*

Use base-10 blocks to model two numbers. Then combine the blocks to model the sum. Blocks of equal value can be exchanged from one area of the mat to the other to help understand carrying...

Lesson Info Launch GizmoCity Tour (Coordinates)

FREE *with no time limit!*

Go sightseeing in fictional cities all over the world. Learn about coordinates on a graph by navigating around these cities on a grid-like city map. Some landmarks are shown on the map. For...

Lesson Info Launch GizmoHeredity and Traits

- Stem Case

*Video Preview*

As a bee scientist, students help a honey farm that has low honey production due to wasps. Students learn about bees, heredity and traits to determine which traits will help the bees defend...

Lesson InfoHoneybee Hive

- New!

FREE *with no time limit!*

Explore life in the hive by meeting workers, drones, and the queen bee herself! Visit flower patches to determine the best sources of food, and then perform a waggle dance to let the other...

Lesson Info Launch GizmoCircuit Builder

FREE *with no time limit!*

Create circuits using batteries, light bulbs, switches, fuses, and a variety of materials. Examine series and parallel circuits, conductors and insulators, and the effects of battery...

Lesson Info Launch GizmoPendulum Clock

FREE *with no time limit!*

Find the effect of length, mass, and angle on the period of a pendulum. The pendulum is attached to a clock that can be adjusted to tell time accurately. The clock can be located on Earth...

Lesson Info Launch GizmoOrder of Operations

FREE *with no time limit!*

Select and evaluate the operations in an expression following the correct order of operations.

Lesson Info Launch GizmoIndependent and Dependent Events

FREE *with no time limit!*

Compare the theoretical and experimental probabilities of drawing colored marbles from a bag. Record results of successive draws to find the experimental probability. Perform the drawings...

Lesson Info Launch GizmoMean, Median, and Mode

FREE *with no time limit!*

Build a data set and find the mean, median, and mode. Explore the mean, median, and mode illustrated as frogs on a seesaw, frogs on a scale, and as frogs stacked under a bar of variable...

Lesson Info Launch GizmoBeam to Moon (Ratios and Proportions)

FREE *with no time limit!*

Apply ratios and proportions to find the weight of a person on the moon (or on another planet). Weigh an object on Earth and on the moon and weigh the person on Earth. Then set up and solve...

Lesson Info Launch GizmoCollision Theory

FREE *with no time limit!*

Observe a chemical reaction with and without a catalyst. Determine the effects of concentration, temperature, surface area, and catalysts on reaction rates. Reactant and product...

Lesson Info Launch Gizmo3D Eclipse

FREE *with no time limit!*

Observe the motions of the Earth, Moon and Sun in three dimensions to investigate the causes and frequency of eclipses. Observe Earth's shadow crossing the Moon during a lunar eclipse, and...

Lesson Info Launch GizmoPhases of the Moon

FREE *with no time limit!*

Understand the phases of the Moon by observing the positions of the Moon, Earth and Sun. A view of the Moon from Earth is shown on the right as the Moon orbits Earth. Learn the names of...

Lesson Info Launch GizmoCell Energy Cycle

FREE *with no time limit!*

Explore the processes of photosynthesis and respiration that occur within plant and animal cells. The cyclical nature of the two processes can be constructed visually, and the simplified...

Lesson Info Launch GizmoSled Wars

FREE *with no time limit!*

Explore acceleration, speed, momentum, and energy by sending a sled down a hill into a group of snowmen. The starting height and mass of the sled can be changed, as well as the number of...

Lesson Info Launch GizmoModeling and Solving Two-Step Equations

FREE *with no time limit!*

Solve a two-step equation using a cup-and-counter model. Use step-by-step feedback to diagnose and correct incorrect steps.

Lesson Info Launch GizmoDividing Exponential Expressions

FREE *with no time limit!*

Choose the correct steps to divide exponential expressions. Use the feedback to diagnose incorrect steps.

Lesson Info Launch GizmoRotations, Reflections, and Translations

FREE *with no time limit!*

Rotate, reflect, and translate a figure in the plane. Compare the translated figure to the original figure.

Lesson Info Launch GizmoConcurrent Lines, Medians, and Altitudes

FREE *with no time limit!*

Explore the relationships between perpendicular bisectors, the circumscribed circle, angle bisectors, the inscribed circle, altitudes, and medians using a triangle that can be resized and...

Lesson Info Launch GizmoIntroduction to Exponential Functions

FREE *with no time limit!*

Explore the graph of the exponential function. Vary the initial amount and base of the function. Investigate the changes to the graph.

Lesson Info Launch GizmoGraphs of Polynomial Functions

FREE *with no time limit!*

Study the graphs of polynomials up to the fourth degree. Vary the coefficients of the equation and investigate how the graph changes in response. Explore things like intercepts, end...

Lesson Info Launch GizmoCompound Interest

FREE *with no time limit!*

Explore compound interest in-depth, from compounded annually to compounded continuously. In addition, compare the END POINTS graph, with dots that fit an exponential curve, to the ALL TIME...

Lesson Info Launch GizmoGraphs of Derivative Functions

FREE *with no time limit!*

What does the graph of a derivative function look like? What can a derivative function tell you about the original function? What can't it tell you? Explore these questions for five...

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 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 GizmoSmelling in the Rain: Designing Solutions to Improve Air Quality

- Stem Case

*Video Preview*

A respiratory physiologist is concerned about the number of asthma attacks in children within her community. On certain days, the number is higher than the respiratory physiologist might...

Lesson InfoIsotopes

- New!

FREE *with no time limit!*

Explore what isotopes are by adding protons and neutrons to the nucleus of an atom. Plot both stable and radioactive isotopes on a graph of neutrons vs. protons, and explore how the...

Lesson Info Launch GizmoMeiosis

- New!

FREE *with no time limit!*

Explore how sex cells are produced by the process of meiosis. Compare meiosis in male and female germ cells, and use crossovers to increase the number of possible gamete genotypes. Using...

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 GizmoCoral Reefs 1 - Abiotic Factors

FREE *with no time limit!*

Explore the abiotic factors that affect Caribbean coral reefs. Many factors can be manipulated in this simplified reef model, including ocean temperature and pH, storm severity, and input...

Lesson Info Launch GizmoHoliday Snowflake Designer

FREE *with no time limit!*

Fold paper and cut in a certain way to make symmetrical snowflakes with six sides (similar to what can be found in nature) or with eight sides (an easier folding method). This simulation...

Lesson Info Launch GizmoNumber Line Frog Hop (Addition and Subtraction)

FREE *with no time limit!*

Live a frog's life as you hop along a number line in search of flies. Learn how addition and subtraction can be represented as movement along a number line. Fred the frog may even help you...

Lesson Info Launch GizmoMascot Election (Pictographs and Bar Graphs)

FREE *with no time limit!*

A brand new school is opening and it is time to elect the school mascot! Students can choose the Eagle, Lion, Bear, or Wolf. Voting results can be displayed in a table, tally chart,...

Lesson Info Launch GizmoFunction Machines 1 (Functions and Tables)

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 GizmoMagnetism

FREE *with no time limit!*

Drag bar magnets and a variety of other objects onto a piece of paper. Click Play to release the objects to see if they are attracted together, repelled apart, or unaffected. You can also...

Lesson Info Launch GizmoSolar System

FREE *with no time limit!*

Explore our solar system and learn the characteristics of each planet. Compare the sizes of planets and their distances from the Sun. Observe the speeds of planetary orbits and measure how...

Lesson Info Launch GizmoEyes and Vision 3 - Sensing Light

- New!

FREE *with no time limit!*

Observe how photoreceptors on the retina are stimulated by different colors of light. Determine that cone cells are stimulated by specific colors of light and enable us to see color, while...

Lesson Info Launch GizmoDistance-Time Graphs

FREE *with no time limit!*

Create a graph of a runner's position versus time and watch the runner complete a 40-yard dash based on the graph you made. Notice the connection between the slope of the line and the speed...

Lesson Info Launch GizmoPercents and Proportions

FREE *with no time limit!*

Find a part from the percent and whole, a percent from the part and whole, or a whole from the part and percent using a graphic model.

Lesson Info Launch GizmoTrends in Scatter Plots

FREE *with no time limit!*

Examine the scatter plot for a random data set with negative or positive correlation. Vary the correlation and explore how correlation is reflected in the scatter plot and the trend line.

Lesson Info Launch GizmoLucky Duck (Expected Value)

- New!

FREE *with no time limit!*

Pick a duck, win a prize! Help Arnie the carnie design his game so that he makes money (or at least breaks even). How many ducks of each type should there be? What are the prizes worth? How...

Lesson Info Launch GizmoHeat Absorption

FREE *with no time limit!*

Shine a powerful flashlight on a variety of materials, and measure how quickly each material heats up. See how the light angle, light color, type of material, and material color affect...

Lesson Info Launch GizmoTrebuchet

FREE *with no time limit!*

Design your own trebuchet to fling a projectile at a castle wall. All of the dimensions of the trebuchet can be adjusted, as well as the masses of the counterweight and payload. Select a...

Lesson Info Launch GizmoCell Types

FREE *with no time limit!*

Explore a wide variety of cells, from bacteria to human neurons, using a compound light microscope. Select a sample to study, then focus on the sample using the coarse and fine focus...

Lesson Info Launch GizmoCladograms

- New!

FREE *with no time limit!*

Based on the similarities and differences between different organisms, create branching diagrams called cladograms to show how they are related. Use both morphological data (physical...

Lesson Info Launch GizmoEarthquake-Proof Homes

- New!

FREE *with no time limit!*

Design a house to withstand an earthquake and protect the people living inside. Select a location in San Francisco, then choose the design and materials for a foundation, frame, walls, and...

Lesson Info Launch GizmoQuadratics in Factored Form

FREE *with no time limit!*

Investigate the factors of a quadratic through its graph and through its equation. Vary the roots of the quadratic and examine how the graph and the equation change in response.

Lesson Info Launch GizmoRational Functions

FREE *with no time limit!*

Compare the graph of a rational function to its equation. Vary the terms of the equation and explore how the graph is translated and stretched as a result. Examine the domain on a number...

Lesson Info Launch GizmoSystems of Linear Inequalities (Slope-intercept form)

FREE *with no time limit!*

Compare a system of linear inequalities to its graph. Vary the coefficients and inequality symbols in the system and explore how the boundary lines, shaded regions, and the intersection of...

Lesson Info Launch GizmoLinear Functions

FREE *with no time limit!*

Determine if a relation is a function from the mapping diagram, ordered pairs, or graph. Use the graph to determine if it is linear.

Lesson Info Launch GizmoSurface and Lateral Areas of Pyramids and Cones

FREE *with no time limit!*

Vary the dimensions of a pyramid or cone 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 GizmoPolling: City

FREE *with no time limit!*

Poll residents in a large city to determine their response to a yes-or-no question. Estimate the actual percentage of yes votes in the whole city. Examine the results of many polls to help...

Lesson Info Launch GizmoRadians

- New!

FREE *with no time limit!*

As factory belt operator, your job is to move boxes just the right distance on the belt, so they can be stamped for delivery. Your only controls are the radius and rotation of the belt’s...

Lesson Info Launch GizmoElectron Configuration

FREE *with no time limit!*

Create the electron configuration of any element by filling electron orbitals. Determine the relationship between electron configuration and atomic radius. Discover trends in atomic radii...

Lesson Info Launch GizmoNuclear Reactions

FREE *with no time limit!*

Explore examples of nuclear fusion and fission reactions. Follow the steps of the proton-proton chain, CNO cycle, and fission of uranium-235. Write balanced nuclear equations for each step,...

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 GizmoProtein Synthesis

- Stem Case

*Video Preview*

As a pediatrician, students learn about genes and protein synthesis to try to help a baby girl named Lucy who has an immunodeficiency disease.

Lesson InfoWater Contamination

- Stem Case

*Video Preview*

There has been an outbreak of legionnaires’ disease in a small town. This disease is caused by legionella bacteria that proliferate in contaminated water supplies. Students take on the role...

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 January 1 and July 1.

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.

Modeling Fractions (Area Models)

FREE *with no time limit!*

Model and compare fractions using area models. Set the denominators with the arrow buttons, and then set the numerators with the arrow buttons or by clicking in the models. Compare fractions visually, on a number line, or numerically using the least common denominator.

Lesson Info Launch GizmoChocomatic (Multiplication, Arrays, and Area)

FREE *with no time limit!*

Use the Chocomatic to design candy bars made out of chocolate squares. Use multiplication to find the number of squares in each chocolate bar. Build collections of chocolate bars that all have the same number of squares. Solve multiplication problems by joining two smaller chocolate bars into a large bar.

Lesson Info Launch GizmoAdding Whole Numbers and Decimals (Base-10 Blocks)

FREE *with no time limit!*

Use base-10 blocks to model two numbers. Then combine the blocks to model the sum. Blocks of equal value can be exchanged from one area of the mat to the other to help understand carrying when adding. Four sets of blocks are available to model different place values.

Lesson Info Launch GizmoCity Tour (Coordinates)

FREE *with no time limit!*

Go sightseeing in fictional cities all over the world. Learn about coordinates on a graph by navigating around these cities on a grid-like city map. Some landmarks are shown on the map. For others, you are only given the coordinates. Can you find all of them?

Lesson Info Launch GizmoHeredity and Traits

- Stem Case

*Video Preview*

As a bee scientist, students help a honey farm that has low honey production due to wasps. Students learn about bees, heredity and traits to determine which traits will help the bees defend their hives against the wasps. They then pick a new queen bee to pass on these traits to the bee colony.

Lesson InfoHoneybee Hive

- New!

FREE *with no time limit!*

Explore life in the hive by meeting workers, drones, and the queen bee herself! Visit flower patches to determine the best sources of food, and then perform a waggle dance to let the other bees know where to go. Can you help the bees find enough food to save the hive?

Lesson Info Launch GizmoCircuit Builder

FREE *with no time limit!*

Create circuits using batteries, light bulbs, switches, fuses, and a variety of materials. Examine series and parallel circuits, conductors and insulators, and the effects of battery voltage. Thousands of different circuits can be built with this Gizmo.

Lesson Info Launch GizmoPendulum Clock

FREE *with no time limit!*

Find the effect of length, mass, and angle on the period of a pendulum. The pendulum is attached to a clock that can be adjusted to tell time accurately. The clock can be located on Earth or Jupiter to determine the effect of gravity.

Lesson Info Launch GizmoOrder of Operations

FREE *with no time limit!*

Select and evaluate the operations in an expression following the correct order of operations.

Lesson Info Launch GizmoIndependent and Dependent Events

FREE *with no time limit!*

Compare the theoretical and experimental probabilities of drawing colored marbles from a bag. Record results of successive draws to find the experimental probability. Perform the drawings with replacement of the marbles to study independent events, or without replacement to explore dependent events.

Lesson Info Launch GizmoMean, Median, and Mode

FREE *with no time limit!*

Build a data set and find the mean, median, and mode. Explore the mean, median, and mode illustrated as frogs on a seesaw, frogs on a scale, and as frogs stacked under a bar of variable height.

Lesson Info Launch GizmoBeam to Moon (Ratios and Proportions)

FREE *with no time limit!*

Apply ratios and proportions to find the weight of a person on the moon (or on another planet). Weigh an object on Earth and on the moon and weigh the person on Earth. Then set up and solve the proportion of the Earth weights to the moon weights.

Lesson Info Launch GizmoCollision Theory

FREE *with no time limit!*

Observe a chemical reaction with and without a catalyst. Determine the effects of concentration, temperature, surface area, and catalysts on reaction rates. Reactant and product concentrations through time are recorded, and the speed of the simulation can be adjusted by the user.

Lesson Info Launch Gizmo3D Eclipse

FREE *with no time limit!*

Observe the motions of the Earth, Moon and Sun in three dimensions to investigate the causes and frequency of eclipses. Observe Earth's shadow crossing the Moon during a lunar eclipse, and the path of the Moon's shadow across Earth's surface during a solar eclipse. The angle of the Moon's orbit can be adjusted, as well as the distance of the Moon from the Earth.

Lesson Info Launch GizmoPhases of the Moon

FREE *with no time limit!*

Understand the phases of the Moon by observing the positions of the Moon, Earth and Sun. A view of the Moon from Earth is shown on the right as the Moon orbits Earth. Learn the names of Moon phases and in what order they occur. Click Play to watch the Moon go around, or click Pause and drag the Moon yourself.

Lesson Info Launch GizmoCell Energy Cycle

FREE *with no time limit!*

Explore the processes of photosynthesis and respiration that occur within plant and animal cells. The cyclical nature of the two processes can be constructed visually, and the simplified photosynthesis and respiration formulae can be balanced.

Lesson Info Launch GizmoSled Wars

FREE *with no time limit!*

Explore acceleration, speed, momentum, and energy by sending a sled down a hill into a group of snowmen. The starting height and mass of the sled can be changed, as well as the number of snowmen. In the Two sleds scenario, observe collisions between sleds of different masses and starting heights.

Lesson Info Launch GizmoModeling and Solving Two-Step Equations

FREE *with no time limit!*

Solve a two-step equation using a cup-and-counter model. Use step-by-step feedback to diagnose and correct incorrect steps.

Lesson Info Launch GizmoDividing Exponential Expressions

FREE *with no time limit!*

Choose the correct steps to divide exponential expressions. Use the feedback to diagnose incorrect steps.

Lesson Info Launch GizmoRotations, Reflections, and Translations

FREE *with no time limit!*

Rotate, reflect, and translate a figure in the plane. Compare the translated figure to the original figure.

Lesson Info Launch GizmoConcurrent Lines, Medians, and Altitudes

FREE *with no time limit!*

Explore the relationships between perpendicular bisectors, the circumscribed circle, angle bisectors, the inscribed circle, altitudes, and medians using a triangle that can be resized and reshaped.

Lesson Info Launch GizmoIntroduction to Exponential Functions

FREE *with no time limit!*

Explore the graph of the exponential function. Vary the initial amount and base of the function. Investigate the changes to the graph.

Lesson Info Launch GizmoGraphs of Polynomial Functions

FREE *with no time limit!*

Study the graphs of polynomials up to the fourth degree. Vary the coefficients of the equation and investigate how the graph changes in response. Explore things like intercepts, end behavior, and even near-zero behavior.

Lesson Info Launch GizmoCompound Interest

FREE *with no time limit!*

Explore compound interest in-depth, from compounded annually to compounded continuously. In addition, compare the END POINTS graph, with dots that fit an exponential curve, to the ALL TIME graph, which has a more step-like appearance.

Lesson Info Launch GizmoGraphs of Derivative Functions

FREE *with no time limit!*

What does the graph of a derivative function look like? What can a derivative function tell you about the original function? What can't it tell you? Explore these questions for five different types of functions: linear, quadratic, cubic, absolute value, and sine.

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.

Crumple 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 GizmoSmelling in the Rain: Designing Solutions to Improve Air Quality

- Stem Case

*Video Preview*

A respiratory physiologist is concerned about the number of asthma attacks in children within her community. On certain days, the number is higher than the respiratory physiologist might expect. She thinks something in the environment is causing more rescue inhaler use on those days. As an air quality engineer, students will work collaboratively with a respiratory physiologist to learn how some air pollutants are released directly from sources while others are formed through chemical reactions. Students will develop a system model to test design solutions to recommend a plan to help decrease air pollution in a community with a record number of asthma cases in children.

Lesson InfoIsotopes

- New!

FREE *with no time limit!*

Explore what isotopes are by adding protons and neutrons to the nucleus of an atom. Plot both stable and radioactive isotopes on a graph of neutrons vs. protons, and explore how the neutron:proton ratio of stable isotopes changes from lighter to heavier elements.

Lesson Info Launch GizmoMeiosis

- New!

FREE *with no time limit!*

Explore how sex cells are produced by the process of meiosis. Compare meiosis in male and female germ cells, and use crossovers to increase the number of possible gamete genotypes. Using meiosis and crossovers, create "designer" fruit fly offspring with desired trait combinations.

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 GizmoCoral Reefs 1 - Abiotic Factors

FREE *with no time limit!*

Explore the abiotic factors that affect Caribbean coral reefs. Many factors can be manipulated in this simplified reef model, including ocean temperature and pH, storm severity, and input of excess sediments and nutrients from logging, sewage, and agriculture. Click "Advance year" to see how the reef responds to these changes.

Lesson Info Launch GizmoHoliday Snowflake Designer

FREE *with no time limit!*

Fold paper and cut in a certain way to make symmetrical snowflakes with six sides (similar to what can be found in nature) or with eight sides (an easier folding method). This simulation allows you to cut virtual paper on the computer screen with round dot or square dot "scissors" of various sizes before using physical paper.

Lesson Info Launch GizmoNumber Line Frog Hop (Addition and Subtraction)

FREE *with no time limit!*

Live a frog's life as you hop along a number line in search of flies. Learn how addition and subtraction can be represented as movement along a number line. Fred the frog may even help you get better at adding and subtracting two-digit numbers in your head by decomposing them into tens and ones.

Lesson Info Launch GizmoMascot Election (Pictographs and Bar Graphs)

FREE *with no time limit!*

A brand new school is opening and it is time to elect the school mascot! Students can choose the Eagle, Lion, Bear, or Wolf. Voting results can be displayed in a table, tally chart, pictograph, bar graph, circle graph, or dot plot. You can change student votes by selecting a group of students and clicking a mascot.

Lesson Info Launch GizmoFunction Machines 1 (Functions and Tables)

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. Stack up to three function machines together. Input and output can be recorded in a table and on a graph.

Lesson Info Launch GizmoMagnetism

FREE *with no time limit!*

Drag bar magnets and a variety of other objects onto a piece of paper. Click Play to release the objects to see if they are attracted together, repelled apart, or unaffected. You can also sprinkle iron filings over the magnets and other objects to view the magnetic field lines that are produced.

Lesson Info Launch GizmoSolar System

FREE *with no time limit!*

Explore our solar system and learn the characteristics of each planet. Compare the sizes of planets and their distances from the Sun. Observe the speeds of planetary orbits and measure how long each planet takes to go around the Sun.

Lesson Info Launch GizmoEyes and Vision 3 - Sensing Light

- New!

FREE *with no time limit!*

Observe how photoreceptors on the retina are stimulated by different colors of light. Determine that cone cells are stimulated by specific colors of light and enable us to see color, while rod cells are stimulated by various colors and do not contribute to color vision. Experiment by varying the percentage of rod and cone cells in normal and dim light to see how rod cells help with night vision.

Lesson Info Launch GizmoDistance-Time Graphs

FREE *with no time limit!*

Create a graph of a runner's position versus time and watch the runner complete a 40-yard dash based on the graph you made. Notice the connection between the slope of the line and the speed of the runner. What will the runner do if the slope of the line is zero? What if the slope is negative? Add a second runner (a second graph) and connect real-world meaning to the intersection of two graphs.

Lesson Info Launch GizmoPercents and Proportions

FREE *with no time limit!*

Find a part from the percent and whole, a percent from the part and whole, or a whole from the part and percent using a graphic model.

Lesson Info Launch GizmoTrends in Scatter Plots

FREE *with no time limit!*

Examine the scatter plot for a random data set with negative or positive correlation. Vary the correlation and explore how correlation is reflected in the scatter plot and the trend line.

Lesson Info Launch GizmoLucky Duck (Expected Value)

- New!

FREE *with no time limit!*

Pick a duck, win a prize! Help Arnie the carnie design his game so that he makes money (or at least breaks even). How many ducks of each type should there be? What are the prizes worth? How much should he charge to play? Lucky Duck is a fun way to learn about probabilities and expected value.

Lesson Info Launch GizmoHeat Absorption

FREE *with no time limit!*

Shine a powerful flashlight on a variety of materials, and measure how quickly each material heats up. See how the light angle, light color, type of material, and material color affect heating. A glass cover can be added to simulate a greenhouse.

Lesson Info Launch GizmoTrebuchet

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Design your own trebuchet to fling a projectile at a castle wall. All of the dimensions of the trebuchet can be adjusted, as well as the masses of the counterweight and payload. Select a target on the Launch tab, or just see how far your projectile will go.

Lesson Info Launch GizmoCell Types

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Explore a wide variety of cells, from bacteria to human neurons, using a compound light microscope. Select a sample to study, then focus on the sample using the coarse and fine focus controls of the microscope. Compare the structures found in different cells, then perform tests to see if the sample is alive.

Lesson Info Launch GizmoCladograms

- New!

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Based on the similarities and differences between different organisms, create branching diagrams called cladograms to show how they are related. Use both morphological data (physical traits) and molecular data to create the simplest and most likely cladograms. Five different sets of organisms are available.

Lesson Info Launch GizmoEarthquake-Proof Homes

- New!

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Design a house to withstand an earthquake and protect the people living inside. Select a location in San Francisco, then choose the design and materials for a foundation, frame, walls, and roof. Decide which extras to add to your home design. Test each house in an earthquake and assess the damages. Try to arrive at a house design that results in the least damage.

Lesson Info Launch GizmoQuadratics in Factored Form

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Investigate the factors of a quadratic through its graph and through its equation. Vary the roots of the quadratic and examine how the graph and the equation change in response.

Lesson Info Launch GizmoRational Functions

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Compare the graph of a rational function to its equation. Vary the terms of the equation and explore how the graph is translated and stretched as a result. Examine the domain on a number line and compare it to the graph of the equation.

Lesson Info Launch GizmoSystems of Linear Inequalities (Slope-intercept form)

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Compare a system of linear inequalities to its graph. Vary the coefficients and inequality symbols in the system and explore how the boundary lines, shaded regions, and the intersection of the shaded regions change in response.

Lesson Info Launch GizmoLinear Functions

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Determine if a relation is a function from the mapping diagram, ordered pairs, or graph. Use the graph to determine if it is linear.

Lesson Info Launch GizmoSurface and Lateral Areas of Pyramids and Cones

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Vary the dimensions of a pyramid or cone 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 GizmoPolling: City

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Poll residents in a large city to determine their response to a yes-or-no question. Estimate the actual percentage of yes votes in the whole city. Examine the results of many polls to help assess how reliable the results from a single poll are. See how the normal curve approximates a binomial distribution for large enough polls.

Lesson Info Launch GizmoRadians

- New!

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As factory belt operator, your job is to move boxes just the right distance on the belt, so they can be stamped for delivery. Your only controls are the radius and rotation of the belt’s wheel. How do you set these to get the distance right? See how this relates to arc length, and discover how radians help make this task easier.

Lesson Info Launch GizmoElectron Configuration

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Create the electron configuration of any element by filling electron orbitals. Determine the relationship between electron configuration and atomic radius. Discover trends in atomic radii across periods and down families/groups of the periodic table.

Lesson Info Launch GizmoNuclear Reactions

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Explore examples of nuclear fusion and fission reactions. Follow the steps of the proton-proton chain, CNO cycle, and fission of uranium-235. Write balanced nuclear equations for each step, and compare the energy produced in each process.

Lesson Info Launch GizmoCrumple Zones

- New!

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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!

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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!

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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.

Protein Synthesis

- Stem Case

*Video Preview*

As a pediatrician, students learn about genes and protein synthesis to try to help a baby girl named Lucy who has an immunodeficiency disease.

Lesson InfoWater Contamination

- Stem Case

*Video Preview*

There has been an outbreak of legionnaires’ disease in a small town. This disease is caused by legionella bacteria that proliferate in contaminated water supplies. Students take on the role of a civil engineer to investigate how the water treatment plant has failed to get rid of all the contaminants in the water and design a new method.

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