Philosophers and scientists have long agonised over the question of free will. Two new books, by Julian Baggini and John Gray, offer some very different answers.
David Whitehouse takes us on a journey where crystals as big as cities and a sea of liquid metal are just some of the wonders you would see.
Fatema Ahmed, our lead fiction reviewer, argues that these semi-autobiographical novels make a case for another vision of literature and the world.
The principle has been greatly tarnished in recent years, writes David Wearing. In an unstable world, does it have a future?
Game of Thrones is not just great television. It speaks to the social and political struggles of our times.