HealthThe alarming drop in US life expectancy shouldn’t be a surprise Life expectancy is down in the US for the first time since the worst years of the AIDS epidemic. It is a critical moment for health policy, says Laudan Aron Comment
SpaceIs new talk of interstellar drive too good to be true? Speculation about the EM drive, a proposed fuel-free, physics-busting starship engine, is back but is it still strictly for dreamers, wonders Geraint Lewis Comment