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In this online version of the classic paper and pencil game, learners practice looking ahead to anticipate an opponent's move.

This is an activity about acid-base reactions using eggs and vinegar. Learners place eggs inside a container of vinegar and leave to soak overnight.

In this activity, learners make a stroboscope--a spinning disk with slits around the edge that you look through.

Closing one eye eliminates one of the clues that your brain uses to judge depth. Trying to perform a simple task with one eye closed demonstrates how much you rely on your depth perception.

In this math activity related to light, learners assemble a photometer and use it to estimate the power output of the Sun.

How far can you see out of the corner of your eye? Grab a partner and find out from the Exploratorium Science Snack.

In this activity, learners practice drawing 3D structures in two dimensions. Learners draw cube stacks from five different points of view.

This perception trick focuses on conflicting information to the brain...instead of trying to see two images, you're trying to get a bright spot by overlapping the image you see through two tubes.