Ask HN: Concepts that clicked only years after you first encountered them?
460 by luuuzeta | 680 comments on Hacker News.
I'm reading Petzold's Code [1], and it dawned on me that I didn't understand logic gates intuitively until now. I took a Computer Architecture course back in college, and I understood what logic gates meant in boolean algebra but not empirically. Petzold clarified this for me by going from the empirical to the theoretical using a lightbulb, a battery, wires, and relays (which he introduces when he talks about the telegraph as a way to amplify a signal). Another concept is the relationship between current, voltage, and resistance. For example, I always failed to understand why longer wires mean more resistance while thicker wires mean less resistance. [1]: https://ift.tt/xWrkbyc
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U.S. Postal Service starts nationwide electric vehicle fleet, buying 9,250 EVs 444 by lxm | 336 comments on Hacker News.
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Omg.lol: An Oasis on the Internet 678 by blakewatson | 301 comments on Hacker News.
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By BY MATT STEVENS AND MAGGIE HABERMAN from NYT U.S. https://ift.tt/2EQzU0Y via IFTTT
