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

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

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.

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