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In this activity, learners use measurement concepts to make models of what their body parts might look like if they were a snake or a chameleon.

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.

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