I guess this tells how much I know about Heinlein...I didn't know it was a "juvenile". Duh, I know! I guess that explains some things, though I stand by my dislike of Uncle Whatsisface (page after page of him playing mind games about the fact that they don't really know what's on the back side of the moon?!?) and the scientific jargon...guess I'm just a happy ignoramus, 'cause I don't like having to attempt to comprehend that stuff - too mentally stenuous for me! I ended up skipping some of the more mathmatical stuff, which probably didn't help my understanding of the story much...
Some general remarks about HTML and such for you and Suzi: the reason why some tags are allowed to have spaces, such as < img src > is because the first part is the name of the tag - what it is - and the second part is one particular behavior of that tag. The "img" tells the browser that it's a picture; the "src" bit says where to find that pic. You can have other things, like "height" and "border" after the "src" too.
The hex tables - if you have Paintshop, or even Paint, open up the color palette and pick the color you want. The hex value should be shown somewhere. If it's just a "200 Red, 50 Blue, 6 Green", you can convert - the hex values are just those numbers in hex - base 16. So "ffffff" is just 256-256-256 - or white.