When it comes to UFOs, most scientists prefer to just say "no." Tackling the issue without damaging his credibility, astronomer William A. Alschuler wrote The Science of UFOs to explore how popular beliefs about aliens and spacecraft intersect with our current understanding of physics and biology. Though guaranteed to enrage extremists on both sides of the belief spectrum, he is careful to be fair to witness and investigator alike. The text is engaging, even fun, as Alschuler dives head-first into geek-out discussions of wormholes, antigravity effects, and alien DNA.....