My Beloved Brontosaurus: On the Road with Old Bones, New Science, and Our Favorite Dinosaurs (Scientific American / Farrar, Straus, and Giroux) by Brian Switek is a jaunty review of how our ideas about dinosaurs have changed.
The Good Nurse: A True Story of Medicine, Madness, and Murder (Twelve) by Charles Graeber tells of a scarily malfunctioning system.
Nathaniel Philbrick in Bunker Hill: A City, A Siege, A Revolution< (Viking) tells the famous story anew.
Serpentine (Abrams) by Mark Laita presents beautiful snakes artistically posed.
Blackett's War: The Men Who Defeated the Nazi U-Boats and Brought Science to the Art of Warfare (Knopf) by Stephen Budiansky tells of the start of Operations Research.
Manifest Injustice: The True Story of a Convicted Murderer and the Lawyers Who Fought for His Freedom (Henry Holt) by Barry Siegel tells of a legal travesty.
The Faithful Executioner: Life and Death, Honor and Shame in the Turbulent Sixteenth Century (Farrar, Straus and Giroux) by historian Joel F. Harrington brings an executioner to life.
In The Hour of Peril: The Secret Plot to Murder Lincoln Before the Civil War (Minotaur Books), historian Daniel Stashower tells how Lincoln was saved.
Weird Life: The Search for Life That Is Very, Very Different from Our Own (W. W. Norton) by David Toomey examines possible organisms we may meet someday.
Storm Kings: The Untold Story of America's First Tornado Chasers (Pantheon Books) by Lee Sandlin tells an story of eventual scientific enlightenment.