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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.

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

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 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.