SpaceThe century-long hunt for the gigantic meteorite that vanished A soldier returned from the Sahara desert in 1916 with a wild story about a meteorite that dwarfed all others. Over 100 years of hunting yielded nothing – but now twin brothers think they have solved the puzzle Features
PhysicsWhy quantum mechanics says the past isn’t 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 – and how much we can manipulate it Comment