“Sergeant Boyle was an Earthling. He was the only Earthling on the expedition. In fact, he was the only creature from the Milky Way. The other members were from all over the place. The expedition was a joint effort supported by about two hundred galaxies. Boyle wasn't a technician. He was an English teacher. The thing was that Earth was the only place in the whole known Universe where language was used. It was a unique Earthling invention. Everybody else used mental telepathy, so Earthlings could get pretty good jobs as language teachers just about anywhere they went. The reason creatures wanted to use language instead of mental telepathy was that they found out they could get so much more done with language. Language made them so much more active. Mental telepathy, with everybody constantly telling everybody everything, produced a sort of generalized indifference to all information. But language, with its slow, narrow meanings, made it possible to think about one thing at a time -- to start thinking in terms of projects.”