Can you make crystals with ingredients from your pantry? Learn about nucleation and supercooling as we deep dive into the science of crystal making. Gather sugar, water, a jar, a stick, a clothespin, a spoon, a cooking pot and a thermometer for this challenge with YELL 2020 teen intern Sophia. Adult supervision strongly recommended.

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STEM Challenge Yo’Self | Teen Takeover is created by the San Francisco Public Library from the Youth Engaged in Library Leadership (YELL) STEM team. Stay STEM-tastic by reading, learning and experimenting at home. Gather materials for a new challenge posted at 3pm on weekdays throughout October. Visit www.sfpl.org/stemchallenge for more resources.