Richard Feynman Explains Rubber Bands https://kottke.org/13/09/richard-feynman-explains-rubber-bands
"Feynman: Rubber Bands FUN TO IMAGINE 3" を YouTube で見る https://youtu.be/XRxAn2DRzgI?si=mgtDZAUx8-GHwsjQ
思考の /dev/null