(Read as research for writing project - following review includes spoilers)

This is the first installment of the Uncle Albert series by Russell Stannard, a retired physics professor. It occupies a tiny niche of books, which double both as novels for children and educational works, to explain science.

In it, a girl of around 11 or so, of the name of Gedanken (German for "thought") repeatedly visits her eccentric, excitable Uncle Albert (loosely modelled on Albert Einstein), who happens to be a physicist, and they learn together about the universe - in this book that means about the theory of relativity. The main device is Uncle Albert's "thought bubbles" - if he thinks hard enough, he can create a real bubble of thought above him, and he can even transport his neice into the bubble, where she can experience anything he can imagine - though he only permits himself to imagine what is possible.

These thought experiments include
1) Her trying to chase a light beam in a big space-ship, but despite going at nearly the speed of light, she never catches up. This demonstrates how light speed is the fastest possible, and that mass is linked with speed.
2) In the next thought experiment, she goes at nearly the speed of light around Jupiter and back, and finds that her watch went slower than her uncle's - so travelling at near the speed of light actually slows down time.
3) Next, on another trip close to light speed,her uncle shows her, via a video recording of the trip, that she and her ship became increasingly flattened as they approached the speed of light.
4) There follows a discussion about how energy is equivalent to mass, although mass has enormous quantities of energy.
5) In the next experiment, light is fired back and forwards from a point in the middle of the space ship while it goes nearly at the speed of light. For Gedanken, it seems to be a dead heat, but from Uncle Albert's perspective outside, it seems that the beam hitting the back gets there first. This shows how important frame of reference is.
6) Frame of reference is reinforced in the last experiment, when Gedanken films earth while zooming away from it nearly at the speed of light. Although it looks as if time is slowing down at the earth from her perspective, Uncle Albert also sees time slowing down at the space-ship from his perspective, because from each perspective they are stationary and the other object is zooming away nearly at the speed of light.

These tricky relativity ideas are explained with remarkable clarity, and not just told, but SHOWN by these thought experiments, with Gedanken constantly being critical, and asking questions to find holes in the ideas, with Uncle Albert at times being honest about problems, either before resolving them, or saying that there are issues. I loved how it was experiments that drove the understanding, and felt in some ways that I had a deeper, more probing grasp of relativity than in many adult science books I've read on the subject. I also liked the fact that Stannard is open about the glaring issue in the story - that if everything is symmetrical, how come the clocks don't match? Apparently, this is where general relativity (which isn't covered in the book - only special) comes in. I would have loved Stannard's explanatory powers to make this issue clear too, but alas I was left frustrated not really to be clear on this one point.

One problem I had, though, as that I'd have loved it if the device to achieve this wasn't so blatantly unscientific and fanciful - people being transported into thought-bubbles and so on was a rather awkward way of showing things, really.

The other issue is that the plot is almost non-existent, and the characters aren't particularly interesting. The science is so weird and exciting, though, that you hardly notice this, and there still is a certain charm to the amateurish fiction part of the book. But it would have been nice BOTH to have a decent plot and characters, as well as the staggeringly strange world of relativity. ( )

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