## Big Bang

Cambridge celebrates 25 years since the first very early Universe workshop

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

*Plus*is a special, marking the occasion of Stephen Hawking's 60th birthday. Plus attended his Birthday Conference in Cambridge, where we interviewed some of the world's most influential mathematicians and physicists.

**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.

*Plus*is very proud to present

**Professor Stephen Hawking**'s own Birthday Symposium address.