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'Dog's best friend' video reveals canine bonds

A partially wet and muddied dog, seeming to shiver from both confusion and cold, runs toward a cameraman in the Arahama area of Sendai, Japan, leading him over to an injured fellow canine, lying among the debris caused by the March 11 earthquake and tsunami. The tearjerking video, making its rounds Full story

'Worm porn' sheds light on evolution of sperm

Watching hours upon hours of worms having sex (yes — essentially worm porn), has helped scientists figure out why some flatworms have simple, thin, squiggly sperm, while others sport larger sex cells with bristles and a feeler in the front. Full story

Embryos Show All Animals Share Ancient Genes

Human embryos resemble those of many other species because all animals carry very ancient genes. These genes date back to the origin of cells, which are expressed during a middle phase of embryonic development, according to two separate papers published in this week's Nature. Full story

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Lizards can't take heat, some go extinct

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