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Cover of THE THING THAT MUST BE TAUGHT Book 4

THE THING THAT MUST BE TAUGHT Book 4

By Philippa Aldersey · 4 parts · 14 h 55 min · English

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Guatemala City, Pittsburgh and a phone in a pocket, 1978 to 2026. Luis von Ahn grows up where a good education is a thing a family buys, and builds a career out of getting strangers to do unpaid work they enjoy: the typing test that proves a visitor is human, the newspaper archive keyed in by people who thought they were only logging in. Then he and Severin Hacker attach the same instinct to language teaching and give it away. Duolingo becomes the most downloaded education app on earth, sells shares to the public in 2021, and spends the years after defending a measurement — the daily streak — that records whether a person came back, and not whether that person learned anything. Covers Luis von Ahn and Duolingo.

Listen

  1. Part 01

    3:16:09

  2. Part 02

    3:27:09

  3. Part 03

    4:16:44

  4. Part 04

    3:55:21

Books in this series

  1. THE THING THAT MUST BE TAUGHT Book 1

    4 parts · 14 h 54 min

  2. THE THING THAT MUST BE TAUGHT Book 2

    4 parts · 13 h 48 min

  3. THE THING THAT MUST BE TAUGHT Book 3

    4 parts · 14 h 36 min

  4. THE THING THAT MUST BE TAUGHT Book 4

    4 parts · 14 h 55 min

  5. THE THING THAT MUST BE TAUGHT Book 5

    4 parts · 15 h 6 min

  6. THE THING THAT MUST BE TAUGHT Book 6

    4 parts · 13 h 38 min