Monsters, Marvels, and the Birth of Science

Finding regularity in nature is the bread and butter of science. We know that reptiles lay eggs, while mammals bear live young; the Earth revolves around the sun every 365.25 days; electrons glom onto protons like bears onto honey. But what if some oddity seems to defy the laws of nature, like the platypus, an egg-laying mammal? What about an anomaly like a two-headed snake? Or a newborn baby who seems to be neither boy nor girl, but something in between?
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