Uploaded February 2020 | Updated September 2026, 3 weeks ago

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Physics Girl riddle: what happens to your image if you bend a spoon from concave to convex?
Check out Antarctic Extremes on PBS Terra: youtube.com/watch?v=EvRAuy1ZmTc

If you like riddles, check out these:
Can you solve the boat puzzle?
youtube.com/watch?v=nVT1c0tr8NE
Which tank fills first? ft. Simone Giertz
youtube.com/watch?v=oxbuFwW5f-Q

Creator/Host: Dianna Cowern
Editor: Levi Butner
Animations: Levi Butner, Keegan Larwin and Dillon Berger
Research: Sophia Chen
Consulting: Dan Walsh

Special thanks to our Sally Ride level patrons: Alejandro Gutierrez, Brian O'Connell, Darkbit, David Cichowski, Edi, Fabrice Eap, Henning Bitsch, Kenneth Hunter, Margaux Lopez, and Zalster.
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Creator/Host: Dianna Cowern
Editor: Levi Butner
Research & Writing: Dianna & Imogen Ashford

Sources:
Halliday Resnick and Walker, Chapter 36, starting on pg. 1140
https://www.acs.psu.edu/drussell/Demos/RayTrace/Mirrors.html
Images:
eso.org/public/images/ann14010a credit: ESO
eso.org/public/news/eso1152 credit: ESO
en.wikipedia.org/wiki/Adaptive_optics#/media/File:A_Laser_Strike_at_the_Galactic_Center.jpg