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Fact You began with about a hundred more bones than you have now Babies have roughly 300. Adults have 206. Nothing was lost. 1 min read Fact Humans have fewer genes than a water flea Around 20,000. The tiny crustacean Daphnia has about 31,000. 1 min read Fact There are more trees on Earth than stars in the Milky Way Roughly three trillion trees. Perhaps a few hundred billion stars. 1 min read Fact A single human eye can detect a single photon The smallest possible quantity of light is not below your threshold. 1 min read Fact Your ears and nose are not still growing They are sagging. Which looks identical and is not the same thing. 1 min read Fact A teaspoon of neutron star would weigh about a billion tonnes An entire sun's worth of matter, crushed into something the size of a city. 1 min read Fact Mothers carry their children’s cells for decades Cells from a pregnancy cross into the mother and stay - sometimes for the rest of her life. 1 min read Fact Adults grew a new bone in the last century The fabella, behind the knee, is three times more common than it was in 1918. 1 min read Fact Saturn is less dense than water Find a bath big enough and the planet would float in it. 1 min read Fact Your nostrils take shifts Right now, one of them is doing most of the work. It will swap in a few hours. 1 min read