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In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light.

free Ages 6 - adult 5 to 10 minutes
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In this activity, learners discover how hard their hearts work to pump blood.

free Ages 4 - 14 Under 5 minutes
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In this online simulation, learners can see adaptation and camouflage in action.

free Ages 8 - 11 10 to 30 minutes
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Play with a slinky and make transverse waves. In this simple Exploratorium Science Snack, learners will experience making waves and will learn the different parts of a wave.

free Ages 6 - 14 Under 5 minutes
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Make a copy of the first stethoscope with only a cardboard tube! René Laennec invented the first stethoscope in 1819 using an actual paper tube!

free Ages 4 - 14 5 to 10 minutes
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This PDF contains 12 calendars (12 months). Each month contains activities about math. Things to do on familiar holidays (like July 4), less common holidays (like Backward Day), and any day.

free Ages 4 - 14 45 to 60 minutes
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This strategy game has simple rules but can be a challenge. Players start with an empty hexagonal grid. On each turn, a player initials one empty hexagon on the grid.

free Ages 8 - 14 10 to 30 minutes
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As learners play this game, they develop logic, geometry, and spatial visualization skills. Players start out with an empty hexagonal grid.

free Ages 4 - 11 10 to 30 minutes
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In this outdoor activity, learners play a game of Tag to discover how neurons attach themselves to each other to form a chain.

free Ages 8 - 18 10 to 30 minutes
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In this activity, learners will compare predicted and observed tides using data from The National Oceanic and Atmospheric Administration(NOAA).

free Ages 14 - 18 45 to 60 minutes
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In this online Flash game, learners test their engineering know-how, moving a collection of mechanical parts onto a board to make complete a system of parts that will move a ball from start to finish.

free Ages 6 - 14 5 to 10 minutes
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In this group or individual activity, learners are encouraged to watch birds near home or school—possibly where birds are nesting in a tree, pecking in a park, feeding from a feeder, or flying through

free Ages 6 - 14 1 to 7 days
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In this activity, learners use tsunami time travel maps to predict how long it will take a tsunami to reach the shore.

free Ages 14 - adult 1 to 2 hours
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This activity is on page 10 (continued on the right side of page 11) of the pdf, part of the Forest Animals Discovery Box. In this game, learners act out the food web.

free Ages 4 - 6 10 to 30 minutes
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In this hands-on activity, learners make the world's simplest Cartesian diver, using only a plastic bottle, some water, and a condiment packet.

free Ages 6 - adult 5 to 10 minutes
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This activity (8th activity on the page) tests learners' ability to identify things using only the sense of hearing.

free Ages 8 - 18 5 to 10 minutes
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Learners build a small rocket using a matchstick and a piece of aluminum foil. A second, lit match launches the match rocket. This activity involves fire; adult supervision required.

free Ages 11 - 14 10 to 30 minutes
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In this card game, learners make two sets of three cards that are alike. Learners must justify to the rest of the players why the three cards belong in each set.

free Ages 8 - 11 10 to 30 minutes
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This activity is designed to let learners measure their reaction time or response time to something they see.

free Ages 8 - 18 10 to 30 minutes
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This activity is about how you form mental images of your body's position in space, independent of vision. Can you take a sip of water from a cup with your eyes closed?

free Ages 11 - 18 10 to 30 minutes