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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.

free Ages 8 - 18 10 to 30 minutes
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The Drawing Board consists of a marking pen that remains stationary and a platform that swings beneath the pen, acting as a pendulum.

Over $20 per group Ages 8 - 14 10 to 30 minutes