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

In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.

In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

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.

Use this hands-on activity to demonstrate infrared and thermal radiation.