Can you use the power of observation to make predictions? Learn about density and buoyancy with two simple, quick and easy experiments. Gather a grapefruit, a large container, 2 eggs, a tablespoon, salt and 2 glasses of water for this challenge with YELL 2020 teen intern Aashka.

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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.