The medical test paradox (well "paradox")
Open with LBRYA link to the full video about Bayesian thinking is at the bottom of the screen.
Or, for reference: https://youtu.be/lG4VkPoG3ko
Long-to-short editing by Dawid Kołodziej
...
https://www.youtube.com/watch?v=xIMlJUwB1m8