Rutgers scientists: Asteroids did kill the dinosaurs

(PhysOrg.com) -- Sometimes, you just can’t trust the iridium. A silvery-white natural metal that’s a member of the platinum family, iridium is a key ingredient in the manufacture of spark plugs. Iridium is also an important piece of evidence in a mystery that scientists have debated for decades – why did dinosaurs disappear from the face of the earth?

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