Chimpanzee Toni celebrated his 50th birthday at the Hellabrunn Zoo in Munich on Nov. 22, 2011. Sven Hoppe/DPA/Landov hide caption

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Sven Hoppe/DPA/Landov

Rule Would List All Chimps As Endangered, Even Lab Animals

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This model of a molar shows color-coded barium banding patterns that reveal weaning age. Ian Harrowell, Christine Austin, Manish Arora/Harvard School of Public Health hide caption

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Ian Harrowell, Christine Austin, Manish Arora/Harvard School of Public Health

Scientific Tooth Fairies Investigate Neanderthal Breast-Feeding

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Fungi (cyan) surround a human hair within the skin. A study in the journal Nature shows the population of fungi on human skin is more diverse that previously thought. Alex Valm, Ph.D. hide caption

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Alex Valm, Ph.D.

Research Reveals Yeasty Beasts Living On Our Skin

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Nanoflowers, each smaller than the thickness of a dollar bill, sprout up spontaneously on a surface dipped in salts and silicon. Courtesy of Wim Noorduin/Harvard University hide caption

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Courtesy of Wim Noorduin/Harvard University

After President Obama overturned Bush-era policy restricting federal funding of embryonic stem cell research in 2009, Nebraska Right to Life led a protest of the research outside the University of Nebraska regents' meeting. Nati Harnik/AP hide caption

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Nati Harnik/AP

Cloning, Stem Cells Long Mired In Legislative Gridlock

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Human embryos grow in a petri dish two days after scientists in Oregon cloned them from a donor's skin cell. http://www.flickr.com/photos/ohsunews/8726915230/in/photostream//Courtesy of OHSU Photos hide caption

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http://www.flickr.com/photos/ohsunews/8726915230/in/photostream//Courtesy of OHSU Photos

A scientist removes the nucleus from a human egg using a pipette. This is the first step to making personalized embryonic stem cells. Courtesy of OHSU Photos hide caption

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Courtesy of OHSU Photos

Scientists Clone Human Embryos To Make Stem Cells

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How Can Identical Twins Turn Out So Different?

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A miniature ninja throwing star or a surgical device? The microgripper, shown here coming out of a catheter tube, is activated by body heat. The sharp appendages fold up when the device warms up. Evin Gultepe, Gracias Lab, Johns Hopkins University. hide caption

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Evin Gultepe, Gracias Lab, Johns Hopkins University.