Sometimes you might desire a heavy hand from an instructor, such as in situations where making a mistake might be costly or you are nervous about being able to deal with a knotty problem.

Fossil fuel-based polyurethane foam has been a firm favourite in furniture manufacturing for over half a century. Jane ...

And again and again, these decorated mathematicians were unable to find a solution to what became known as the Conway knot problem. The problem had to do with proving whether Conway’s knot was ...

For a drama about a man whose heart isn’t in it, he doesn’t always seem to have his heart in it himself – the language knotty to a puzzling degree, the action plotty but jolting. Less ...