Felipe Lincoln said:
Humm, I actually don't ...
Isn't it knowledge?
Not really. Those books are written to explain complicated math in a common language understood by as many people as possible, or as Hawking had put it: "Each formula costs you 10,000 potential readers." Unfortunately, the real physical implications cannot be told without those formulas. As a consequence really many simplifications and metaphors have to be made. The result are many false assumptions and images in people's mind which pop up e.g. here on PF and make it more difficult to learn the actual stuff, as first already learned has to be forgotten again. We have many articles in our insights blog which deal with things like: the rubber sheet model of gravity, virtual particles, black hole concepts, the balloon analogue of an expanding universe etc., which are practically all wrong. And even our section about quantum mechanics is full of endless discussions among experts about
interpretations, which are to be distinguished from the mathematical background, for which there is little dispute about.
I would (and do) only read those books on commuter trains, at doctors' waiting rooms or as bedtime reads. Depending on your goals and age I recommend to read some introductory real textbooks which can actually help you and perhaps save time if you plan to or already do study. If you do not want to go the long way of learning the stuff, and it is a long way, then I'd say read our insight articles. You will not understand all of them, but at least they all are as close as possible to what real science is. I think we have about 400 right now, so there is plenty of good entertainment combined with real insights.
Sure, there are books which are a must-have-read like
A Brief History of Time or
Gödel, Escher, Bach, and they are worth a read, however, more as an appetizer as a scientific textbook.