PhysicsFirst fluid knots created in the lab Mathematical knots cannot be untied – and now they have been made in water, a feat that could boost our grasp of aircraft wings and quantum superfluids News
PhysicsThe quantum Sims: Matter's deepest mysteries recreated Want to make a superconductor, or walk on the surface of a neutron star? Then play around with ultracooled atoms, says Michael BrooksFeatures