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In this online brain stumper, the bottom half of a series of letters is covered. You may think you know what it says, but remove the black bar to see if you're right.

In this activity, learners conduct a simple test to find their blind spot.

In this hands-on botany activity, learners sprout vegetables in film canisters.

This activity shows you how to make a mold terrarium using a jar and leftover food.

In this activity related to light and perception, learners use a pinhole in an index card as a magnifying glass to help their eye focus on a nearby object.

In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

In this activity about osmosis, learners use a naked egg (one with a dissolved eggshell) to learn about selectively permeable membranes.

In this activity, learners construct a cereal chain as a model of how proteins are made in the cell.

In this activity, learners control the (apparent) size of a hole with their brain.

This activity (aka "snack") provides instructions for discovering your blind spot. It is an exploration of light and visual perception using simple materials you may have around the house.

Challenge popular misconceptions, learners explore how a mirror actually reflects an image in this activity.

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 activity, learners create virus models, including nucleic acid and proteins, using simple materials. This resource includes information about virus structure and gene therapy.

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

Sound can travel through a variety of media.

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.

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

Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent.

This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict?