HealthTim Spector's guide to fermentation is meticulous and persuasive We know fermented foods do us good, but the ZOE founder's new book still surprises with fascinating facts - and avoids feeling like an ad for his gut supplements, says Helen Thomson Culture
EnvironmentSuper-cool cement could stop buildings trapping heat inside A new formulation of cement reflects and emits heat more effectively than normal Portland cement, so it stays much cooler on a hot day News