Hyperspace by Michio Kaku

Hyperspace : A Scientific Odyssey Through Parallel Universes, Time Warps, and the 10th Dimension
by Michio Kaku
(Anchor Books, New York: 1995)

READ: January-February 2005

A great book. Definitely a must-read. It's been a while since I last picked up a science book of any kind, but I've become interested more and more in learning about this sort of thing. Over Christmas, a great programme aired on Nova on PBS, called The Elegant Universe, which surveyed the development of multiple dimensions and string theory in the realm of (largely) theoretical physics (also a book, which I intend to read sometime soon as well). I missed it over Christmas (visiting family, etc.), but the programme is available online, and I highly recommend it.

Anyway, it's definitely nerdy of me, but it's a field I find interesting (and one in which I have absolutely no training). I haven't taken a physics class since grade 10 (Secondaire IV for all you hard-core Québecers in the crowd). So I resolved to read it in order to better understand the Nova programme. In clear, simple language, Michio Kaku, a professor of theoretical physics at the City College of the City University of New York, outlines the history of the development of the theory of hyperspace. In a nutshell, things are simpler to understand when expressed in higher dimensions. He gives the (commonly-used) example of someone who is flat and lives in a flat, two-dimensional world. To such a Flatlander, a three-dimensional object would not make sense, as it would never remain constant from second to second. For example, if a 3-D apple were to fall onto the Flatlander's world, a Flatlander could only view it in segmented 2-D slices. Brown lines representing the apple stem. Then red or green lines, changing rapidly, first growing larger then smaller, as the apple passes "through" his world. A Flatlander cannot think in 3-D since there is no way to represent this in his world. We have the same problem living in our three-dimensional world, but it is generally accepted that there are at least four dimensions (the three familiar ones of space, and the fourth of time as posited by Einstein), with the possibility of a fifth (a space-time dimension). However, for hyperspace to be feasible, there are, in fact, many more dimensions - likely 10 or 11. (Some superstring theories, which is related to hyperspace, suggest as many as 26!)

Anyway, a good read for anyone who's wondered about physics but was too scared to ask, as it were. Simple language, good explanations, very interesting.