Very math intensive:
Zero: A Biography of a Dangerous Idea by Charles Seife
Journey through Genius by William Dunhan
e: The Story of a Number by Eli Maor
Not-so-mathy:
Letters to a Young Mathematician by Ian Stewart
Proof by David Auburn
Animals in Translation by Catherine Johnson and Temple Grandin
The Immortal Life of Henrietta Lacks by Rebecca Skloot
Stiff: The Curious Lives of Human Cadavers by Mary Roach
The Martian by Andy Weir
Raptor Red by Robert T. Bakker
Journey to the Center of the Earth by Jules Verne
The Beak of the Finch: A Story of Evolution in Our Time by Jonathan Weiner
Your Inner Fish: A Journey Into the 3.5-Billion-Year History of the Human Body by Neil Shubin
Survival of the Sickest by Sharon Moalem
The Scalpel and the Silver Bear by Elizabeth Cohen Van Pelt and Lori Alvord
The Double Helix: A Personal Account of the Discovery of the Structure of DNA by James Watson
Rosalind Franklin: The Dark Lady of DNA by Brenda Maddox
The Ghost Map by Steven Johnson
Math on Trial: How Numbers are Used and Abused in the Courtroom by Schneps & Colmez
Factfulness by Hans Rosling (read in AP Statistics)
Innumeracy by John Allen Paulos (read in AP Statistics)
Talking to Strangers by Malcolm Gladwell.
The Disappearing Spoon by Sam Kean
Consecrated Dust by Mary Frailey Calland
The Boys in the Boat by Daniel James Brown
Destiny of the Republic by Candice Millard
Devil in the White City by Eric Larson
Dead Wake by Eric Larson
In the Garden of Beasts by Eric Larson
The Blood of Emmett Till by Timothy B. Tyson
The Radium Girls by Kate Moore
Just Mercy by Bryan Stevenson
The Help by Kathrynn Stockett
"When I was a senior, we each got to invite our favorite teacher to our Senior Honors Banquet. I invited my 10th grade chemistry teacher, Mr. Anticole, and he brought me this book. He signed it and told me to "Stay curious!", which is what I always tell my students now." --Mr. Adam
The Alchemy of Air by Thomas Hagar
The Poisoner's Handbook by Deborah Blum
Surely You're Joking, Mr Feynman! by Richard P. Feyman