Based on sales for the week ending April 22, 2012

16. Drop Dead Healthy
A.J. Jacobs, S&S, $26, 9781416599074

17. Mrs. Kennedy and Me
Clint Hill, Gallery, $26, 9781451648447

18. The Blood Sugar Solution
Mark Hyman, M.D., Little Brown, $27.99, 9780316127370

19. Go the F**k to Sleep
Adam Mansbach, Ricardo Cortes (Illus.), Akashic, $14.95, 9781617750250

20. Behind the Beautiful Forevers
Katherine Boo, Random House, $27, 9781400067558

21. Thinking, Fast and Slow
Daniel Kahneman, FSG, $30, 9780374275631

22. In the Garden of Beasts
Erik Larson, Crown, $26, 9780307408846

23. The Swerve
Stephen J. Greenblatt, Norton, $26.95, 9780393064476

24. When Women Were Birds
Terry Tempest Williams, Angela Williams, FSG, $23, 9780374288976

25. Why Be Happy When You Could Be Normal?
Jeanette Winterson, Grove Press, $25, 9780802120106

26. Killing Lincoln
Bill O'Reilly, Martin Dugard, Holt, $28, 9780805093070

27. Goodnight iPad
Ann Droyd, Blue Rider, $14.95, 9780399158568

28. Revelations
Elaine Pagels, Viking, $27.95, 9780670023349

29. Escape from Camp 14
Blaine Harden, Viking, $26.95, 9780670023325

30. Why Nations Fail
Daron Acemoglu, James A. Robinson, Crown Business, $30, 9780307719218

31. American Sniper
Chris Kyle, et al., Morrow, $26.99, 9780062082350

32. Trickle Down Tyranny
Michael Savage, Morrow, $26.99, 9780062083975

33. The Righteous Mind
Jonathan Haidt, Pantheon, $28.95, 9780307377906

34. When I Was a Child I Read Books
Marilynne Robinson, FSG, $24, 9780374298784

35. Plenty
Yotam Ottolenghi, Chronicle, $35, 9781452101248

36. Paris in Love
Eloisa James, Random House, $26, 9781400069569

37. What Teachers Make
Taylor Mali, Putnam Adult, $19.95, 9780399158544

38. The Age of Insight
Eric Kandel, Random House, $40, 9781400068715

39. Dropped Names
Frank Langella, Harper, $25.99, 9780062094476

40. The Pioneer Woman Cooks
Ree Drummond, Morrow, $29.99, 9780061997181

41. House of Stone
Anthony Shadid, Houghton Mifflin Harcourt, $26, 9780547134666

42. Imperfect
Jim Abbott, Tim Brown, Ballantine, $26, 9780345523259

43. Catherine the Great
Robert K. Massie, Random House, $35, 9780679456728

44. How to Cook Everything: The Basics
Mark Bittman, Wiley, $35, 9780470528068

45. Jesus Calling
Sarah Young, Integrity, $15.99, 9781591451884

46. Mother's Love
Melina Gerosa Bellows, National Geographic Society, $9.95, 9781426209222

47. Crossing the Borders of Time
Leslie Maitland, Other Press, $27.95, 9781590514962

48. Religion for Atheists
Alain de Botton, Pantheon, $26.95, 9780307379108

49. Strengths Finder 2.0
Tom Rath, Gallup, $24.95, 9781595620156

50. The World of Downton Abbey
Jessica Fellowes, St. Martin's, $29.99, 9781250006349