PhysicsThe fascinating story of the ultimate cosmic law How do we know the speed of light – and why does it have a speed limit at all? Leah Crane explores the history of one of the most important numbers in the universe Comment
PhysicsSwirly lasers can control an ungovernable cousin of magnetism Short pulses of light that impart rotation on a material's atoms can be used to switch a property called ferroaxiality, which could let us build very stable and efficient memory devices 51¶¯Âþ