The sharpest images ever taken of matter around the probable black hole at the centre of our Galaxy bring us within grasp of a crucial test of general relativity — a picture of the black hole's 'point of no return'.

Large volcanic eruptions cool the world ocean. In doing so, they temporarily reduce the increase in ocean heat content and the rise in sea level attributed to warming caused by greenhouse-gas emissions.

Static pictures of protein structures are so prevalent that it is easy to forget they are dynamic molecular machines. Characterizing their intrinsic motions may be necessary to understand how they work.