Can you make butter with only one ingredient? Try this edible food experiment and see how cream changes with just a bit of arm power. Gather heavy cream and a jar with a lid for this challenge with Librarian Vinnie.

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STEM Challenge is created by the San Francisco Public Library from our librarian lab. Stay STEM-tastic by reading, learning and experimenting at home. Visit www.sfpl.org/stemchallenge for more resources.

In response to feedback from our Black community and staff, we updated the original name STEM Challenge Yo’Self to STEM Challenge on July 19, 2021. We recognize the original title is appropriated from Black vernacular and perpetuates racism, and has caused harm to our Black/BIPOC community members and staff. Our library is working towards being an anti-racist institution and committed to doing better.