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In this activity, learners discover the primary physical properties used to separate pure substances from mixtures.

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.

In this activity, learners make a scale model of the Solar System and learn the real definition of "space." Learners use the online calculator to create an appropriate scale to use as a basis for thei

This Exploratorium activity explores size and scale. Through four levels of screen sizes, learners can sort out objects of different sizes.