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...easily among the fattest places on the earth - a distinction we've held for more than 20 years now - and it's no surprise as to how we got this way. Our cars, computers and 40-in. TVs have all conspired to take the physical exercise out of our lives and replace it with round-the-clock sitting. Combine sedentary living with cheap food and supersize portions (the U.S. now produces enough food every day for each of us to consume 3,800 calories, never mind that we need only about 2,350 for a healthy diet), and there...
Between 40,000 and 30,000 years ago, Neanderthals - the hulking, thick-skulled species closely related to us - vanished from the earth, leaving us as the last humans standing. Nobody knows for sure what happened to them. Maybe we killed them off. Maybe we outcompeted them for scarce resources during the waning decades of the last Ice Age. Or maybe - though this is still hotly debated - we simply mated with them, which would mean we all have a bit of Neanderthal in us.(See the top 10 scientific discoveries...
...better explanation at hand. The giant planets could have formed in a much more sensible location, like Jupiter did, and then migrated inward, establishing a stable orbit there. It all made sense, except for one tiny problem: this same model also suggested that a little world like Earth shouldn't exist at all; it (or more precisely, the moon-size proto-planets that eventually assembled into Earth) should have spiraled into the sun more than 4 billion years ago. A star might not gobble a Jupiter whole when it moves close enough, but it could surely swallow a canap...
...problem," admits Mordecai-Mark Mac Low, an astronomer at New York's American Museum of Natural History. Or, rather, it was a problem - but Mac Low and his collaborators may have solved it. In a paper recently submitted to the Astrophysical Journal, they say that the old, Earth-destroying theory was generally accurate but lacked some key details - ones that both reshape theories about how planets form and, oh yes, allow the planet we know best to exist. (See an illustrated history of Earth...
...more than three decades, the Sea Shepherd Conservation Society has rammed, sabotaged and shot stink bombs at whalers and commercial fishermen. Watson founded Sea Shepherd's forerunner Earth Force Society in 1977, and since then, he and his organization have not shied away from controversy. He has attacked Greenpeace, an organization he also helped found, calling the group "the Avon Ladies of the environmental movement" because of their allegedly wimpy tactics. Over the years, Watson has come under firearms attack four times, according to his website. In a 2008 Whale Wars episode that some critics have said was faked, Watson...