PhysicsMetallic hydrogen finally made in lab at mind-boggling pressure Diamonds, low temperatures and pressures way above what's found at Earth's centre were used to create a form of hydrogen foreseen back in the 1930s News
LifeReindeer riddle: How do you tell caribou apart? Studying indigenous names for the animals may help us clear up a decades-long mix-up over caribou classification and reverse population decline Features