Until recently, travelling through time seemed little more than fantasy. But quantum theory and particularly relativity open up ways to make time travel possible - and I still find it remarkable that no physical law prevents it.
How to Build a Time Machine explores our best understanding of time but really concentrates on how to manipulate it. There's the story of a time traveller's convention where no one turned up, and a tour through the remarkable possibilities of real time travel that emerge from quantum entanglement, superluminal speeds, neutron star cylinders and wormholes in space. There's even a physics professor who believes it's possible to build a working general relativity time machine on the desktop. I think it's just a fascinating subject.
If anyone in the UK fancies a copy, I'm afraid it doesn't come out here until January (as Build Your Own Time Machine) - but it can already be pre-ordered from Amazon, via the book's web page.
It's a bit soon for reviews (except those sent through a time machine), but here's a couple of early comments:
Brian Clegg conjectures on the world of time and space travel and brings it all beautifully down to earth. Brilliant. - Johnny Ball
A solid overview of some of the quirkier corners of physics, with an entertaining connection to pop culture. - Kirkus Reviews