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The upcoming centennial of Einstein’s paper sends Tabitha M. Powledge in search of a primer on general relativity. Also, does the reported discovery of hydrothermal vents on Enceladus mean that there could be life on one of Saturn's moons? And a new paper in PLOS Medicine asserts that, just as the tobacco industry spent decades covering up the health effects of smoking, so has Big Sugar influenced the National Institutes of Health on the role of sugar in tooth decay.