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Why is air pollution so harmful to us? Human being's DNA may hold the answer
Man coughs up a massive, intact blood clot shaped perfectly like his lung passages
A toddler receives mother's kidney and part of her liver in pioneering transplant
Here's how living in extreme altitude forces the human body to conserve energy
Prehistoric fish reveals the secret of your smile
Both jaws and teeth are parts of the anatomy that help make a pretty smile, but their evolutionary origins have just been discovered, thanks to a long dead fish.
