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Fri, 26 Apr 2019 What is the shed in “watershed”? Is it a garden shed? No. I guessed that it meant a piece of land that sheds water into some stream or river. Wrong! The Big Dictionary says that this shed is:
This meaning of “shed” fell out of use after the end of the 17th century. [Other articles in category /lang/etym] permanent link This week I learned that there are no fewer than seven fanfics on AO3 that concern the Complaint letter to Ea-Nasir, a 3750-year-old Babylonian cuneiform tablet from an merchant angry at the poor-quality copper ingots he was sold. Truly, we live in an age of marvels. I've said here before that I don't usually find written material funny, with very rare exceptions. But this story, Pay me Baby, Treat me Right, was a rare exception. I found it completely sidesplitting. (Caution: sexual content.) [ Addendum: However, I still demand to know: Where the hell is my Sonar Taxlaw fanfic? Fanfic writers of the world, don't think this gets you off the hook! ] [Other articles in category /book] permanent link This is definitely the worst thing I learned this month. It's way worse than that picture of Elvis meeting Nixon. Nobel Laureate and noted war criminal Henry Kissinger is also an honorary member of the Harlem Globetrotters. As Maciej Cegłowski said, “And yet the cruel earth refuses to open and swallow up everyone involved.” [Other articles in category /misc] permanent link
Sometimes it matters how you get there
Katara was given the homework exercise of rationalizing the denominator of $$\frac1{\sqrt2+\sqrt3+\sqrt5}$$ which she found troublesome. You evidently need to start by multiplying the numerator and denominator by !!-\sqrt2 + \sqrt 3 + \sqrt 5!!, obtaining $$ \frac1{(\sqrt2+\sqrt3+\sqrt5)}\cdot \frac{-\sqrt2 + \sqrt 3 + \sqrt 5}{-\sqrt2 + \sqrt 3 + \sqrt 5} = \frac{-\sqrt2 + \sqrt 3 + \sqrt 5}{(-2 +3 + 5 + 2\sqrt{15})} = \frac{-\sqrt2 + \sqrt 3 + \sqrt 5}{6 + 2\sqrt{15}} $$ and then you go from there, multiplying the top and bottom by !!6 - 2\sqrt{15}!!. It is a mess. But when I did it, it was much quicker. Instead of using !!-\sqrt2 + \sqrt 3 + \sqrt 5!!, I went with !!\sqrt2 + \sqrt 3 - \sqrt 5!!, not for any reason, but just at random. This got me: $$ \frac1{\sqrt2+\sqrt3+\sqrt5}\cdot \frac{\sqrt2 + \sqrt 3 - \sqrt 5}{\sqrt2 + \sqrt 3 - \sqrt 5} = \frac{\sqrt2 + \sqrt 3 - \sqrt 5}{(2 +3 - 5 + 2\sqrt{6})} = \frac{\sqrt2 + \sqrt 3 - \sqrt 5}{2\sqrt{6}} $$ with the !!2+3-5!! vanishing in the denominator. Then the next step is quite easy; just get rid of the !!\sqrt6!!: $$ \frac{\sqrt2 + \sqrt 3 - \sqrt 5}{2\sqrt{6}}\cdot \frac{\sqrt6}{\sqrt6} = \frac{\sqrt{12}+\sqrt{18}-\sqrt{30}}{12} $$ which is correct. I wish I could take credit for this, but it was pure dumb luck. [Other articles in category /math] permanent link
Men who are the husbands of someone important
It's often pointed out that women, even famous and accomplished women, are often described in newspaper stories as being someone's wife, but that the reverse rarely occurs. The only really well-known exception I could think of was Pierre Curie, who was a famous, prizewinning scientist (1903 Nobel Laureate, yo), but is often identified as having been the husband of Marie Skłodowska Curie (also 1903 Nobel Laureate). But last week brought another example to my attention. There ware a great many news articles reporting that Salma Hayek's husband had pledged money to help rebuild Notre Dame cathedral. His name is François-Henri Pinault, and he is a billionaire. And the husband of Salma Hayek. For example: Notre Dame fire – Salma Hayek’s French billionaire husband Francois-Henri Pinault pledges £86million (etc.) [Other articles in category /misc] permanent link Mon, 01 Apr 2019Yesterday I mentioned the rook:
This is the “rook” that is a sort of crow, C. frugilegus. It is not related to the rooks in chess. That word is from Arabic (and earlier, Persian) rukh, which means a chariot. Before the game came to Europe, the rooks were chariots. Europeans didn't use chariots, so when they adopted the game, they changed the chariots to castles. (Similarly the elephants turned into bishops.) Okay, I've known all this for years, but today I had another thought. Why were there chariots in the Persian form of the game? The Persians didn't use chariots either. Chariots had been obsolete since the end of the Bronze Age, thousands of years, and chess is nothing like that old. The earliest forerunner of chess was played in India. But I confirmed with Wikipedia that it didn't overlap with chariots:
Were the Guptas still using chariots in the 6th century? (And if so, why?) I think they weren't, but I'm not sure. Were the chariots intentionally anachronistic, even at the time the game was invented, recalling a time of ancient heroes? [Other articles in category /tech] permanent link |