Image courtesy of NASA shows an artist's concept of a broken-up asteroid. Scientists think that a giant asteroid, which broke up long ago in the main asteroid belt between Mars and Jupiter, eventually made its way to Earth and led to the extinction of the dinosaurs. REUTERS/NASA/JPL-Caltech/Handout
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I think the car was already wrapped around the tree with all occupants critical and the asteroid was the bullet to the head.
Maybe diarrhea killed the dinos.