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An Alien's Guide to Conquering the Earth Naturally

Devious sci-fi aliens have hatched many plots to conquer humanity, but the natural world has outdone the best laid plans of Martians.

May 3, 2013
6:00 AM EDT
| Jens Petersen, Wikimedia Commons
A giant eruption of solar material ­ over 20 Earths long ­shooting off the lower right side of the sun on July 7, 2012. | NASA/SDO/AIA
| Tim Wall
| Shanghai killer whale, Wikimedia Commons
| Fredric Remington, Google Art Project, Wikimedia Commons
| Shane Torgerson, Wikimedia Commons
| NASA Earth Observatory
A facial reconstruction of a 14-year-old girl whose remains found in Jamestown, Va. suggest she was cannibalized. | Artist: StudioEIS; Photo: Don Hurlbert, Smithsonian