This story was originally published on Gizmodo
People from different parts of the world look different, and sometimes it feels weird to ask why. But yes, there is in fact chemistry and genetics behind the way we look.
Take a redhead’s freckled skin and red hair, for example. These traits come mainly from the way one gene controls the production of melanin, the pigments behind skin and hair colour. A new video from the American Chemical Society’s Reactions channel walks through how that…
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