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In this activity related to indoor air pollution, learners build take-home dust catchers with wax paper and petroleum jelly.

In this math lesson, learners apply the concepts of ratio and proportion to determine the length of the Statue of Liberty's torch-bearing arm.

In this activity about the brain and sleep (on page 138 of the PDF), learners measure their resting breathing rates. Learners will discover that breathing frequencies vary amongst individuals.

In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships.

In this math lesson, learners learn how to construct stem and leaf plots. Learners first estimate the number of drops of water that will fit on the head of a penny.

In this activity, learners investigate color vision as well as plan and conduct their own experiments.

In this lab activity, learners explore how to initiate a density current. Learners measure six flasks with different concentrations of salt and water (colored blue).

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

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 investigate various appliances and electronics, discovering how much energy each uses and how much carbon dioxide (CO2) is released to produce that energy.

In this activity, learners estimate risks associated with different events and compare their estimates to the real possibilities.

In this activity, learners explore how various energy sources can be used to cause a turbine to rotate.

In this activity, learners discover that they can modify a regular piece of paper so that it's large enough for them to walk through!

In this activity (18th on the page), learners conduct an experiment to examine memory.

In this activity (on page 134 of the PDF), learners explore reaction time.

In this math lesson, learners identify, describe, and construct the five regular polyhedra.

In this quick activity (page 1 of the PDF under SciGirls Activity: Tug O' War), learners will test how many pennies a flat paper index card bridging the gap between two stacks of books is able to supp

In this activity, learners will build the highest tower they can out of recycled materials.

In this activity, learners interpret three trackways and use measurements and a formula to infer the relative speed of dinosaurs.