PhysicsWhy quantum mechanics says the past isn鈥檛 real The famous double-slit experiment brings into question the very nature of matter. Its cousin, the quantum eraser experiment, makes us question the very existence of time 鈥 and how much we can manipulate it 91色情片
MathematicsThese centuries-old equations predict flowing fluid 鈥 until they don鈥檛 We use the Navier-Stokes equations every day, for applications from building rockets to designing drugs. But sometimes they break 鈥 and we don鈥檛 know why 91色情片