The bluefin tuna is a magnificent creature. A silvery torpedo, it grows as big as 1,000 pounds, swims as fast as cars, and survives the cold waters of the ocean, weirdly enough, as warm-blooded fish. Oh, it also happens to be pretty tasty as sushi. Thanks to our growing sushi appetites, the bluefin tuna seems likely to be obliterated off the face of the Earth unless we do something drastic—like stop eating it or, what the hell, use science to start spawning them in tanks on land….