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Humans

Copenhagen climate summit yields ‘real deal’ to limit greenhouse gases

Nonbinding accord still needs beefing up, negotiators agree.

Physics

Liquid light bender proposed

Tiny nanoparticles dispersed in fluid may hide objects.

Psychology

Newborns nurse long-term memories of smells

Newborn babies readily link specific scents to breast-feeding and favor those smells as toddlers.

Life

Alligators breathe like birds

Tricky measurements of flow reveal that air moves through the animal in one direction.

Climate

Acidifying ocean may stifle phytoplankton

Chemical changes in seawater make a key nutrient less available to these organisms.