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Michael Hartl
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Michael Hartl
@mhartl
Forever curious. @TauDay founder. @Caltech, @YCombinator alum. “Hartl understands physics deeply… and like Feynman he is an outstanding pedagogue.” —Kip Thorne
Los Angeles, CA
michaelhartl.com
Joined November 2007
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  • Pinned
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    Michael Hartl
    @mhartl
    Jan 3, 2021
    Deep understanding can look like closed-mindedness to the uninitiated.
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    Michael Hartl
    @mhartl
    Oct 29, 2024
    I feel like this may prove to be the most prescient cartoon of the 21st century.
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    510K
  • user avatar
    Michael Hartl
    @mhartl
    May 13, 2021
    Just to review: #Tesla cars are Good because they use electricity. 🙏 #Bitcoin miners are Bad because… they use electricity. 🤔
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    Michael Hartl
    @mhartl
    Feb 15, 2020
    There’s absolutely no way I could pass the coding interview at any of the big tech companies. Even the ones where the interviewer learned to code from one of my tutorials.
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    Max Woolf
    @minimaxir
    Feb 15, 2020
    A good Hacker News comment on tech interviews.
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    Michael Hartl
    @mhartl
    Oct 22, 2024
    Evergreen meme
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    70K
  • user avatar
    Michael Hartl
    @mhartl
    Jan 15, 2024
    Replying to @Austen
    There are whole countries like this.
    118K
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    Michael Hartl
    @mhartl
    Nov 30, 2021
    One of my uncles was ostensibly an executive at a major oil company, only he wasn’t: it was actually his cover as an agent for the CIA. If your model of reality doesn’t include intelligence agents in major industry and media organizations, you’re probably missing something big.
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    Michael Hartl
    @mhartl
    Feb 9, 2021
    One of my most valuable experiences was watching #Bitcoin tumble from nearly $20K to $3K and being totally fine with it. Adopting a long time horizon helped me achieve a Zen-like calm even as I watched a significant fraction of my portfolio evaporate (temporarily) into thin air.
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    Michael Hartl
    @mhartl
    Feb 14, 2023
    Replying to @MovingToTheSun
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    77K
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    Michael Hartl
    @mhartl
    Apr 13, 2021
    Normal people seeing my account: Pros: Blue checkmark, impressive educational credentials in bio Cons: Laser eyes, #Bitcoin in bio #Bitcoin Twitter seeing my account: Cons: Blue checkmark, impressive educational credentials in bio Pros: Laser eyes, #Bitcoin in bio
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    Michael Hartl
    @mhartl
    Aug 13, 2024
    Replying to @colin_fraser
    I reproduced this and was eventually able to get ChatGPT to recognize its error.
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    372K
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    Michael Hartl
    @mhartl
    Jul 13, 2025
    Replying to @LFauexProd
    The Duality of Man
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    92K
  • user avatar
    Michael Hartl
    @mhartl
    Aug 10, 2025
    Replying to @bananafitz
    theonion.com/asian-man-has-…
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    56K
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    Michael Hartl
    @mhartl
    Jul 26, 2024
    Einstein: “I have no special talent.” Feynman: “I was an ordinary person who studied hard.” Fish: “What’s water?”
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    David Bessis
    @davidbessis
    Jul 25, 2024
    Replying to @davidbessis
    People typically assume innate talent for *others*, rarely for themselves. What did Einstein, Descartes, Feynman and Grothendieck think of innate talent? Check out these fascinating quotes!
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    114K
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