Knots crop up all over the place, from tying a shoelace to molecular structure, but they are also elegant mathematical objects. Colin Adams asks when is a molecule knot a molecule? and what happens if you try to build a knot out of sticks?
Who says that academics don't have a sense of style? Two researchers from the University of Cambridge's Department of Physics have brought a whole new sartorial dimension to the daily ritual of putting on a tie.