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In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

In this activity, learners build their own magnetometer using an empty soda bottle, magnets, laser pointer, and household objects.

In this self-measuring activity, learners observe and record how many times a minute they blink, take a breath, and chew, as well as how many times a minute their heart beats.

In this outdoor activity and fun race, learners first find the most common type of tree in a forest site.