On 25 September, a sensational rumour appeared on Twitter: Lawrence Krauss, a cosmologist, reported hearing that the world’s largest gravitational-wave observatory had seen a signal, barely a week after its official re-opening.
The Sendai Nuclear Power Plant on the island of Kyushu broke a four-year lull on 11 August when it switched one of its reactors back on. The restart is the first since Japan’s nuclear-power industry ground to a halt two years ago following safety concerns in the wake of the 2011 Fukushima Daiichi disaster.
