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In this activity, learners use their hands as tools for indirect measurement.

In this "Sid the Science Kid" activity, learners use their bodies to measure a room. Instead of inches or feet, how many kids does it take to measure the length of a room?

This activity is designed to let learners measure their reaction time or response time to something they see.

In this activity, learners investigate whether more people are squares or rectangles. People with similarly sized heights and arm spans are classified as squares.

Create a “Find Someone” list, with about 10 items, each containing a shape, number, or measurement. Can you find someone in the group with hair about 4 inches long? Someone wearing parallel lines?

In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

In this activity, learners will decide together on a question about how far, long or high the group could reach together.

In this activity, learners use their estimation skills to match the unmarked containers to their amounts.

Yes, you can weigh your car by figuring out your wheel's tire pressure combined with the "tire's footprint." You'll need someone with a car, driver's license, and safety in mind.

In this mathematics activity, learners use a map to determine the coordinates of and distance between two locations--both by road and "as the crow flies".

In this activity, learners explore a scale by comparing objects, which look similar but have different weights. Learners predict and then measure the weights of various objects using a scale.

In this online activity, learners adjust mountain snowfall and temperature to see how glaciers grow and shrink. They will use scientific tools to measure thickness, velocity and glacial budget.

In this kinesthetic activity that demonstrates pressure, learners act as air molecules in a "container" as defined by a rope.

In this activity (9th activity on the page), learners work in pairs to see how their perception of touch differs from reality.

In this online activity, learners measure their pulse rates and investigate how their pulses change when they engage in different activities.

This is an activity about prediction. How far can you hop in 5 seconds? Could you make it to the door? Across the room? Everyone lines up and tries it.

In this online activity, learners use a realistic mass and spring laboratory. They hang masses from springs and adjust the spring stiffness and damping.

In this activity, learners estimate how much water they think can be found in various locations on the Earth in all its states (solid, liquid, and gas) to discover the different water ratios in the Ea