What I saw on the web on 2021.12.20

1. The hidden background noise that can catch criminals
   by Tom Scott speaking with Amelia Gully
   https://www.youtube.com/watch?v=e0elNU0iOMY
   a clever technique using data that just happens to be there
   via rss
   
   
2. Bertrand's Paradox
   by Grant Sanderson talking to Brady Haran
   https://www.youtube.com/watch?v=mZBwsm6B280
   three perfectly good solutions to a question. which give completely different answers. ???
   via rss