Sethuraman Panchanathan resigned Thursday as director of the US National Science Foundation.Credit: Graeme Sloan/Sipa US/AlamyFresh turmoil has hit the US National Science Foundation (NSF): hundreds more of the agency’s research grants were terminated today on top of the hundreds already terminated last week, Nature has learnt. The new terminations come one day after the agency’s director abruptly resigned and NSF staff members were offered incentives to retire early due to “future restructuring...