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In this activity, learners conduct an experiment to test how fast they can react. Learners try to catch a piece of paper with a ruler printed on it (or a ruler) as quickly as they can.

Spin a short piece of PVC pipe that's been marked up, and watch a triangle appear. Enjoy this optical illusion from the Exploratorium's Science Snack series.

This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match.

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