Collection of seventeen nonfiction science essays from *The Magazine of Fantasy and Science Fiction*. Out, Damned Spot! The Sun Shines Bright The Noblest Metal of Them All How Little? Siriusly Speaking Below the Horizon Just Thirty Years A Long Day's Journey The Inconstant Moon The Useless Metal Neutrality! The Finger of God Clone, Clone of My Own Alas, All Human The Unsecret Weapon More Crowded! Nice Guys Finish First!