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
TechnologyJacket that gets thinner when you sweat could help avoid overheating A material made from bacterial cellulose alters its insulating properties in dry and moist conditions, which could help you stay a comfortable temperature whatever the weather News