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James Burke : The Day The Universe Changed: "Credit Where It's Due", 1 of 5 (CC)
root: "The Turnip" Grew in Autumn, ready in winter. Animals loved it! Another high-tech import was clover. It put nitrogen in the soil, though they didn't know it, And it would turn the worst scrub into: "Instant arable" That's when they started to say someone was "in clover" when he was well off. And then one of them had a really brilliant idea: Take a group of fields and rotate the crops in them. Wheat first then corn then turnips then clover then wheat again and so on. Does good ...

Lec 12 | MIT 3.091 Introduction to Solid State Chemistry
point of 87 Kelvin. And I told you, whenever you see a solid, that you have to conclude that it is held together by some force. Let's imagine that we are at liquid nitrogen temperature. We take some argon out of an argon gas cylinder and we flow it through a tube. And that tube is immersed in liquid nitrogen. Liquid nitrogen is 77 Kelvin. Well, that is below 84. The argon is going to solidify. It is going to deposit on the walls of the tube. And after a while I will have argon ice. I am ...