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The best way to defend yourself against a shark is to punch its nose. To improve your chances of surviving a shark attack, we spoke with George Burgess, director of the Florida Program for Shark Research and manager of the International Shark Attack File. See more from the International Shark Attack File: https://www.floridamuseum.ufl.edu/shark-attacks/ Science Insider

The Earth is really, really old. Over 4 1/2 billion years old, in fact. How do we begin to comprehend a number that large? It helps to put it on a more fathomable scale. Watch to see where Earth’s major events would fall on a timeline stretching across the US. Science Insider tells you all