Time is a persistent theme in Jim Al-Khalili's account of modern physics. The book is based on a series of lectures that he gave to schoolchildren for the Institute of Physics, although it is also intended for adults. It aims to explain topics such as quantum mechanics, relativity, the big bang and black holes in a way that is accessible to the non-specialist. Mr Al-Khalili explains that time is thought to have started along with the universe in the big bang, about 15 billion years ago (for comparison, the sun is about halfway through its life of about 10 billion years). Time also has a direction: although most physical processes are reversible, there is roughly speaking a tendency (familiar to parents) for the world to become ever less organised.However, time does not always flow at the same rate: travelling close to the speed of light or falling into a black hole slows the passage of time
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