Yesterday, I discovered a strange-looking package on the floor beneath my letterbox. It wasn't an Amazon package, and I couldn't recall having ordered anything else, so I viewed this unusually-shaped envelope with deep suspicion. There was clearly something thicker than a letter inside, but the package was upside-down, so I couldn't gain any idea of its provenance without turning it over. Could it be a letter-bomb? I'm well-known for my dislike of Coldplay; could it be an IED from a deranged Chris Martin fan? Gingerly, I decided to flip the package over with my left hand; this way, at least I would only lose one arm. Imagine my pleasure and surprise, then, when I flipped the package over and found that it came from CERN! Yes, I'd forgotten that I'd requested the latest copy of the 'Particle Physics Booklet' from them, just the previous week.
Written in a pacy style, this handy, pocket-sized, 3" by 5" booklet specifies, in 320 pages, all the known properties of all the known elementary particles and subatomic particles. There's even a calendar on the back, so that you can trace the progress of the Earth in its orbit around the Sun.
This booklet is great for settling arguments in the pub. Did you know, for example, that the mass of the electron is 0.51099892 +/- 0.00000004 MeV?