EarthHumans needed barley to conquer Tibet's giddy heights Swapping millet for hardier crops from the west enabled permanent settlements to move up to the heady heights of Tibet 3600 years ago 51¶¯Âþ
LifeAre we ready for quantum biology? In Life on the Edge, Jim Al-Khalili and Johnjoe McFadden argue quantum effects are decisive in biology – but this challenging idea needs proof CultureLab