SCIENCE - Smooth or grainy? New paper reviews research on the grain of space-time

Smooth" or grainy? Is space-time continuous or is it made up of very fine (10-35 metres on the "Planck scale") but discrete grains, if we look at it very close up ? If the latter were true, scientists think, this would lead to deviations from the theory of special relativity formulated by Albert Einstein more than 100 years ago ...

http://phys.org/news/2013-12-smooth-grainy-paper-grain-space-time.htm