Though we've found evidence for asteroid strikes around the time the dinosaurs died, other explanations have always abounded...Now, research says that other factors may have been contributing to the dino-demise with an asteroid strike simply being the last straw...take a look.
http://news.nationalgeographic.com/news/2013/13/130212--chicxulub-asteroid-dinosaurs-volcano-mass-extinction-environment-science/
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