Can you defy aerodynamics? Learn how to create a fun pencil catapult launcher and explore some physics concepts. Gather 12 pencils, scissors, rubber bands, a small piece of cardboard and masking tape for this challenge with YELL 2020 teen interns Annabelle, Colten, Jayce, Leilani, Ryan and Saw.

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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.