Anyone curious to know more about time travel? *crickets chirping* Anyway, I'll pretend someone's interested. The book in question is Paul Davies' How To Build A Time Machine.
The best trait of this book I'd say is its short length and articulate English language. It explains things pretty well, although it is a quick moving book. It also discusses other weird stuff in physics like exotic matter (e.g. negative energy, imaginary matter, etc.), black holes, and singularities. The primary route of time travel that this book focuses on is a wormhole, so if you're interested specifically in black holes or wormholes this is a must-read. Otherwise, for those of you who like weird but true stuff or need to look smart, this is a good book. However, I want to point out something that the book doesn't really emphasize a lot- this is all based on theory, we still don't know enough to be sure that it's possible, and even if creating a wormhole to travel in time is possible, it's not going to happen for a looooonnnnng time- as in, don't count on your great-great-great-grandchildren to be time traveling.
Another book that kokopelli recommends that is scientific in a sense is Bill Bryson's A Short History of Nearly Everything. This was written by a well established writer who got a little curious about how scientists discover stuff, so he went on a "quest" to learn as much as he could- and wrote a book about it, of course. It's a funny book with lots of really weird (and sometimes sad) tales of scientists. The downsides to this book is that it's really long and that the science gets... pushed to the side at times and is a little unclear. Still, I highly recommend reading at least a chapter or two of this book (you don't have to finish- I didn't either).
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