CALLING CARD  Male túngara frogs like this one attract their mates with a series of chirpy croaks. When picking between two calls, females tend to prefer a lower tone and more quickly repeated calls, but adding in a third suitor with an unattractive song may change a female’s preference between the two other males.  


CHANGING FACE  An immunodeficient man has been excreting live poliovirus for 28 years. His viral strains differ from the one he received in a vaccine. A simulated virus particle shows some of these changes, in surface regions (red) that interact with human immune proteins and elsewhere (blue).   

stack papers

VANISHING EFFECTS  An international project finds that statistically significant findings reported in papers published in three major psychology journals often disappear when independent teams redo the original studies.

illustration of a ring of light around a black hole

RECORDED IN LIGHT  A ring of light surrounds the boundary of a black hole in this artist illustration. Stephen Hawking theorizes that light on this boundary encodes information about everything that falls into the black hole.

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