PhysicsWe may need a fourth law of thermodynamics for living systems The laws of thermodynamics don't accurately account for the complex processes in living cells – do we need a new one to accurately measure the ways living systems are out of equilibrium? News
PhysicsThe US is unlikely to test nuclear weapons, despite what Trump says President Donald Trump appears to have ordered a return to nuclear testing after decades of uneasy but effective treaties banning the practice – but will it actually happen? Analysis