Can you defy aerodynamics? Learn how to create a catapult launcher just with a couple of easy-to-find household items and the science behind how it is able to launch. Gather popsicle sticks, rubber bands, glue, a plastic bottle cap and cotton balls for this challenge with YELL 2020 teen intern Bryce.

Tune in to SFPL YouTube.

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.