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In this activity on page 1 of the PDF, learners compare the relative sizes of biological objects (like DNA and bacteria) that can't be seen by the naked eye.

An ordinary camera has a lens that makes an image on film. In a pinhole camera, a small hole replaces the lens.

Put math of measurement into lining up — and make waiting in line fun. Choose a size characteristic that learners can physically compare, such as foot length or hair length.

String Thing is an interactive online game in which learners change a virtual string's tension, length, and gauge to create different musical pitches.

This activity (on page 2 of the PDF under SciGirls Activity: Soccer Ball Kick) is a full inquiry investigation into transfer of motion.