A Facebook study that manipulated news feeds was not definitively unethical and offered valuable insight into social behaviour, says Michelle Meyer.
Nature 511 265 doi: 10.1038/511265a
After two decades and more than half a billion dollars, LIGO, the world's largest gravitational-wave observatory, is on the verge of a detection. Maybe.
Nature 511 278 doi: 10.1038/511278a