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By Gretchen Cuda Kroen Frozen water droplets take on a whole new shape when they freeze: Instead of staying round, they form a pointy tip, and eventually sprout a tiny forest of ice crystals on their surface. In order to observe these effects, researchers dripped tiny beads of water on a plate kept at a chilly -20°C.

Drinking Water: A History by James Salzman Overlook Press, 2012 (($27.95)) Salzman's account of drinking water makes the liquid seem as mythic as the fountain of youth. He explores the engineering, politics and health implications surrounding humans' quest for water, as well as the toxins and changing climate that threaten our supply.