## Articles

**Sir Martin Rees**gives

*Plus*a whistlestop tour of some of the more extraordinary features of our cosmos, and explains how lucky we are that the universe is the way it is.

**Professor Gerardus 't Hooft**has always been fascinated by the mathematical mysteries of nature. He tells

*Plus*about his early life, and what our Universe might really be like.

**Professor Kip Thorne**shows us how to eavesdrop on these cosmic events by watching for telltale gravitational waves.

**Brian Butterworth**tells us about research showing that even newborn babies have a basic understanding of number. It seems we are all mathematicians!

**C. J. Sangwin**shows us how eighteenth-century mathematician Leonhard Euler solved one of the foremost infinite series problems of his day.

**Paulus Gerdes**takes us on a tour of the mathematical properties of some beautiful designs inspired by the traditional art of Angolan tribespeople.

**Colin Adams**asks when is a molecule knot a molecule? and what happens if you try to build a knot out of sticks?