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Cake day: 2023年6月27日

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  • The point is that people are going to see that the post was edited, because most platforms will tell them, and the poster is saying “yeah, it’s edited. Don’t worry, the meaning hasn’t changed”.

    Asking how you’d tell if they were lying is really missing the point. It’s not evidence being presented in a court of law, it’s social etiquette.

    Handshakes date from a time when the person you’re meeting having a knife they intend to stab you with was a serious concern, so the custom of grasping each others dominant hand to say “look, I’m not holding a knife” became popular. Doesn’t stop people from having a weapon in their other hand, but would you say handshakes are pointless?






  • You’re overlooking the fact that this development is a side project for them. While they’re designing this rocket, their other rocket is in operational use and has the best success rate of any rocket of its scale in history, and they’d already be considered hugely successful if they never did anything innovative ever again.

    They’re also trying to do something far more difficult than the Saturn 5, in at least two ways. Nobody has ever tried to land a rocket anywhere near as large as either of the stages of this system, and on top of that they’re trying to come up with a design which is cheap to operate, which wasn’t remotely on the cards during the Apollo program.



  • X^0 and 0! aren’t actually special cases though, you can reach them logically from things which are obvious.

    For X^0: you can get from X^(n) to X^(n-1) by dividing by X. That works for all n, so we can say for example that 2³ is 2⁴/2, which is 16/2 which is 8. Similarly, 2¹/2 is 2⁰, but it’s also obviously 1.

    The argument for 0! is basically the same. 3! is 1x2x3, and to go to 2! you divide it by 3. You can go from 1! to 0! by dividing 1 by 1.

    In both cases the only thing which is special about 1 is that any number divided by itself is 1, just like any number subtracted from itself is 0













  • “shortest route” and “straight line” actually mean pretty much the same thing. The shortest route is the straight line. Sorry if I confused the matter by switching up the terminology.

    Flying parallel to the lines of latitude would mean that your bearing doesn’t change much, sure, but flying in a straight line would require your heading to change continuously.

    The aircraft in the screenshot was flying a very not-straight course


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