Feynman on ‘Why?’ reminds me of writing executive summaries in post mortems: https://www.youtube.com/watch?v=wMFPe-DwULM&feature=related (watching series thanks to @gadievron)

Feynman: Magnets FUN TO IMAGINE 4 But see NEW UPDATED file at https://tinyurl.com/ycphc432This is the original upload of the piece. There is now a much higher quality version at https://tinyurl.com/ycphc432 Enjoy!See also Feynman MAGNETS EXTRA on...YouTube