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Mars still remains the astrobiology community's number one choice for 'nearest rock with life,' but there are many researchers who argue that the moons of Jupiter are better bets. In particular, Europa, Ganymede, and Callisto are all thought to hide vast oceans of liquid water beneath their icy, outer skins.

Mars, we know, was once wet and warm. Was it home to life? And what can living and learning to work on its rust-colored surface teach us about the future of our own planet, Earth? Answering those mysteries may hold the key to our future.

Martha Graham, along with George Balanchine, is one of the two commanding figures in 20th-century American dance. For those much younger than I am, her genius as a performer will have to be taken on faith - and on the always-suspect evidence of film. What will last, if things go well, is her genius as a choreographer, as a woman of the theater.