gravity

Over the last few years the words string theory have nudged their way into public consciousness. It's a theory of everything in which everything's made of strings — or something like that. But why strings? What do they do? Where did the idea come from and why do we need such a theory? David Berman has an equation-free introduction for beginners.
What goes up must come down — or does it? Find out how to cheat gravity with Julian Havil.
What is the cosmological constant?
In the last issue Lewis Dartnell explained how chaos on the brain is not only unavoidable but also beneficial. Now he tells us why the same is true for our solar system and sends us on a journey that has been travelled by comets and spacecraft.
Extrasolar planets have been grabbing the headlines

Two people who get on well together can often find their relationship destabilised by the arrival of a third into their orbit.

In issue 29 of Plus, we heard how a simple mathematical equation became the subject of a debate in the UK parliament. Chris Budd and Chris Sangwin continue the story of the mighty quadratic equation.
Solving the mathematics of drapery may help change the way we shop.
Did you know that every instant, gravity waves from outer space are stretching and squeezing you - and everyone and everything else in the universe? Learning more about this mysterious radiation will help us to probe the structure and origins of the universe, explains Anita Barnes.
Scientists have for the first time measured the speed of gravity and tested Einstein's assumption - or have they?