What I saw on the web on 2021.12.21

[reblogarythm]

1. More on Bertrand's Paradox
   by Grant Sanderson speaking with Brady Haran
   https://www.youtube.com/watch?v=pJyKM-7IgAU
   further frustrations from a link from yesterday
   via a link from yesterday
   
   
2. Alice, Bob, and the average shadow of a cube
   by Grant Sanderson
   https://www.youtube.com/watch?v=ltLUadnCyi0
   a deep dive into a straightforward geometrical question
   via rss