Browse by Grade & Topic: Technology and Engineering
Find Gizmos organized by grade level and topic.
See How FREE Gizmos WorkPendulum Clock
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 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 GizmoTrebuchet
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 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 GizmoMuscles and Bones
- New!
See how muscles, bones, and connective tissue work together to allow movement. Observe how muscle contraction arises from the interactions of thin and thick filaments in muscle cells. Using...
Lesson Info Launch GizmoHousehold Energy Usage
Explore the energy used by many household appliances, such as television sets, hair dryers, lights, computers, etc. Make estimates for how long each item is used on a daily basis to get an...
Lesson Info Launch GizmoDigestive System
Digestion is a complex process, involving a wide variety of organs and chemicals that work together to break down food, absorb nutrients, and eliminate wastes. But have you ever wondered...
Lesson Info Launch GizmoEnergy Conversions
Where does energy come from? How does energy get from one place to another? Find out how electrical current is generated and how living things get energy to move and grow. Trace the path of...
Lesson Info Launch GizmoGenetic Engineering
- New!
Use genetic engineering techniques to create corn plants resistant to insect pests or tolerant of herbicides. Identify useful genes from bacteria, insert the desired gene into a corn plant,...
Lesson Info Launch GizmoCircuits
Build electrical circuits using batteries, light bulbs, resistors, fuses, wires, and a switch. An ammeter, a voltmeter and an ohmmeter are available for measuring current, voltage and...
Lesson Info Launch GizmoGMOs and the Environment
- New!
In this follow-up to the Genetic Engineering Gizmo, explore how farmers can maximize yield while limiting ecosystem damage using genetically modified corn. Choose the corn type to plant and...
Lesson Info Launch GizmoEarthquake-Proof Homes
- New!
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 GizmoFlood and Storm-Proof Homes
- New!
Build a home to survive a flood or a hurricane and protect the people inside. Choose materials and a design for the foundation, frame, walls, and roof of the house. Add "extras" such as...
Lesson Info Launch GizmoWater Contamination
- Stem Case
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 Info STEM CasesProgrammable 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 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 GizmoHow 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 Jul 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.
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