Modern science stands on the shoulders of giants, as well as average humans, dwarves and elves, ancient civilizations, and all the bones of the dead—forgotten and otherwise. But sometimes you have to start a new branch of science from scratch. On Uncertain Principles, Chad Orzel continues his count-up to Dec. 25, the birthday of Sir Isaac Newton. Orzel explores the origins of agriculture in the Americas, where nativized people made the best of their local flora, turning a humble, nearly inedible grass into one of the biggest food staples on Earth. Chad writes, "Our other staple crops are also…
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