PhysicsPhysicists reveal the secret to chopping onions without crying Slicing an onion releases tear-inducing chemicals into the air, but the sharpness of the knife and the speed of the cut can affect how these droplets are expelled News
EnvironmentIs the climate change food crisis even worse than we imagined? Extreme weather and a growing population are driving a food security crisis. What can we do to break the vicious cycle of carbon emissions, climate change and soaring food costs – or is it already too late? Features