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How Feynman Taught Himself Trigonometry at 13

Richard Feynman talks about his childhood and teenage years in Far Rockaway, teaching himself advanced mathematics before he even reached high school. Recorded in the 1970s by his friend Ralph Leighton, this conversation covers his self-directed study of trigonometry, his invention of a private mathematical notation to replace "confusing" standard symbols, and his competitive streak on the high school algebra team. I've added historically accurate photos and scans of Feynman's actual personal notebooks from the 1930s to give visual context to the story as it unfolds. Timestamps: 00:00 Self-Teaching Trigonometry at Age 13 00:28 "Trigonometry for the Practical Man" 01:08 The Flagpole Problem (Practical Math) 02:25 Deriving the Formulas 04:15 Inventing a New Notation (Sigma & Tau) 05:17 Disliking "dy/dx" and Inverse Sine 05:47 The Realization: Notation is for Communication 05:56 Hacking Typewriters with Rubber Bands 07:00 The High School Algebra Team 08:30 Speed Math Strategy 09:35 How This Helped at MIT Full transcript included. Audio restored from the Ralph Leighton archives.