biology

Kind of cute. But pretty stupid. A scale model of a baby sauropod in its egg. Tim Boyle/Getty Images hide caption

Many of life's building blocks can be found in the objects bombarding Earth from outer space. Does that mean that life, too, developed elsewhere before arriving here? Mary P. Hrybyk-Keith/NASA hide caption

Egg reassembly machine? Johannes Eisele/AFP/Getty Images hide caption

For centuries, Russians believed putting a brown frog in their milk would keep it fresh. Now scientists are finding chemicals in the frog's slimy goo that inhibit the growth of bacteria and fungi. Stefan Arendt/Corbis hide caption

Moss and a cup fungus growing amid the decomposing leaves of Shakerag Hollow in Sewanee, Tennessee. Courtesy of David Haskell hide caption

Do we really understand what's happening here? Ian Waldie/Getty Images hide caption

The Pirahã people live along the Maici River in Brazil's Amazon region. Courtesy of Dan Everett hide caption

Plants do seem to have a sense of where they want to go. Brent Stirton/Getty Images hide caption