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In this activity, learners use two different techniques to estimate how many little things fit into one bigger thing.

In this activity, learners will predict the size of a giant scale model of a comb or other rectangular object, then make one. If you tripled the size of a dollar bill, could you sit on it?

In this activity (page 23 of PDF), learners conduct an experiment to determine how the size and mass of a projectile affects the area and the volume of an impact crater.

Get all wrapped up in a lesson about skin!

The popular sudoku puzzles use numbers, but the game could played with any set of 9 different objects!

In this classic hands-on activity, learners estimate the length of a molecule by floating a fatty acid (oleic acid) on water.

In this activity, learners will explore how the human brain interprets environmental stimuli.

In this experiment, learners investigate how the size of a wing affects lift. Learners count the number of pennies an egg crate plane wing can hold until the plane will no longer fly.

In this space science activity, learners explore transits and the conditions when a transit may be seen.