Conversational book about the science of the search for extraterrestrial life & extraterrestrial intelligence. Covers the state of scientific speculation about how terrestrial life may have first appeared, how that could apply to the appearance of extraterrestrial life, & what that extraterrestrial life could look like. Also discusses UFOs from a historical & scientific perspective, expressing skepticism, but also refusing to rule them out entirely. For me, the best parts of the book were the ones discussing the search for biosignatures & technosignatures using sophisticated telescopes. Discusses the philosophical & scientific implications of finding extraterrestrial life. An easy & amusing read.