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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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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 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 (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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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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In this guided discussion activity, learners watch a video about Central Africa's Lower Congo River, one of the most biologically diverse rivers in the world.

free Ages 11 - adult 10 to 30 minutes
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Are fingers the only place on the body where we use our sense of touch? In this activity (6th activity on the page), learners test the touch sensitivity of different parts of the body.

free Ages 4 - 18 5 to 10 minutes
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In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils.

free Ages 4 - 18 Under 5 minutes
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In this activity (4th on the page), learners conduct a series of tests to find out which of their ears is more dominant.

free Ages 8 - 14 10 to 30 minutes
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This is a quick and simple demonstration about reflexes (fourth activity on the page). One learner stands behind a see-through barrier like a window or wire screen.

free Ages 8 - 18 Under 5 minutes
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In this activity, learners play a guessing game to explore classification.

free Ages 6 - 11 5 to 10 minutes
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In this activity, learners create models of ionic compounds and observe the chemical formula of binary molecules they have created.

free Ages 14 - adult 1 to 2 hours
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This activity offers learners and their families several ways to raise their awareness together about home water.

free Ages 4 - adult 1 to 7 days
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In this activity (on page 2 of the PDF under GPS: Biodiversity Activity), learners will pair up and take a notebook outdoors to a selected location to observe and record a list of living things that t

free Ages 8 - 14 1 to 2 hours
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In this activity, challenge learners to predict and investigate how many water drops they can fit on one penny.

free Ages 6 - 11 10 to 30 minutes
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In this activity (11th activity on the page), learners use pennies to test their hearing acuity.

free Ages 6 - 18 10 to 30 minutes
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In this demonstration (18th on the page), learners conduct a simple test to explore how the cornea refracts light, which is further bent by the eye lens through a process known as accommodation.

free Ages 8 - 18 Under 5 minutes
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In this quick activity/demonstration (5th on the page), learners explore depth perception.

free Ages 6 - 18 Under 5 minutes