I had it on paper until I lost it in a move. EXCELLENT.
If you get it, don't just look things up or get fixated on one part right then. Skim the WHOLE thing as I did. Actually start to read parts in which you even have a mild curiosity. Some you just pass. However this gives you a good presentment of a very wide variety of sciences and subjects they cover.
Among other things, ever wonder how they measured the speed of light ? Not police RADAR lol but a bunch of mirrors. Big spinning ting and they speed is measure by its RPM. The EXACT boiling point of water even, A pot tells you nothing, what does ? It's in there.
If you got the brain and the curiosity for it, buy it.