An interesting, quick and fun read by xkcd author Monroe that attempts to seriously answer some really odd questions. Questions like can a submarine survive in orbit. If you shot a bullet with the mass of a neutron star at the ground what would happen? If you pitched a baseball at 0.9c what would happen? The stories were short and invariably funny. Sometimes I wish Monroe would show his work and illustrate his reasoning more. It occurred to me that this kind of approach to a textbook on physics would be truly entertaining.