Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Running water to a shop sounds like a small project, but it’s one of those things that snowballs the second you start.

London South East prides itself on its community spirit, and in order to keep the chat section problem free, we ask all members to follow these simple rules. In these rules, we refer to ourselves as ...