The Life and Science of Percy Julian
Activities and Readings
7A.1 (Thought Experiment)

Separating Marbles

Assume you have a mixture of marbles like that pictured in photo 1.

photo of large and small marbles mixed up

Based on what you see here, how could you separate this mixture so that you end up with what you see in photo 2? Here’s challenge: You cannot separate them by hand.

photo of large and small marbles separated

Hint: The mixture contains two types of marbles as seen in photo 3. Are they the same or different? How so? How can this help you? What kind of tools or apparatus could you use for the separation?

photo of a large marble and a small marble

Next: Separating Coins

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