Can you make your favorite ice cream without a machine? Learn chemistry concepts and make delicious ice cream with house-hold ingredients. Gather 2 tablespoons of sugar, a cup of half-and-half, mild or heavy cream, vanilla extract and salt for this challenge with YELL 2020 teen interns Bryce, Leah, Joyce L., Sharon, Elio, Sophia and Aashka.

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STEM Challenge | 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. Visit www.sfpl.org/stemchallenge for more resources.