Based on sales for the week ending February 24, 2013

16. Unlikely Friendships
Jennifer S. Holland, Workman, $13.95, 9780761159131

17. ObamaCare Survival Guide
Nick J. Tate, Humanix, $19.95, 9780893348625

18. Subliminal
Leonard Mlodinow, Vintage Books, $15, 9780307472250

19. What to Expect When You're Expecting
Heidi Murkoff, Sharon Mazel, Workman, $14.95, 9780761148579

20. F in Exams
Richard Benson, Chronicle , $9.95, 9780811878319

21. The Immortal Life of Henrietta Lacks
Rebecca Skloot, Broadway, $16, 9781400052189

22. The Presidents Club: Inside the World's Most Exclusive Fraternity
Nancy Gibbs, Michael Duffy, S&S, $18, 9781439127728

23. America the Beautiful
Ben Carson, Zondervan, $14.99, 9780310330912

24. The World Almanac and Book of Facts 2013
Sarah Janssen (Ed.), World Almanac, $12.99, 9781600571626

25. The New Jim Crow
Michelle Alexander, The New Press, $19.95, 9781595586438

26. Heaven Is for Real
Todd Burpo, Thomas Nelson, $16.99, 9780849946158

27. F for Effort!
Richard Benson, Chronicle, $9.95, 9781452113227

28. The Hare With Amber Eyes
Edmund de Waal, Picador, $16, 9780312569372

29. Argo
Antonio J. Mendez, Matt Baglio, Penguin Books, $16, 9780147509734

30. This Explains Everything
John Brockman (Ed.), Harper Perennial, $15.99, 9780062230171

31. Half the Sky
Nicholas D. Kristof, Sheryl WuDunn, Vintage, $15.95, 9780307387097

32. The Devil in the White City
Erik Larson, Vintage, $16, 9780375725609

33. Outliers
Malcolm Gladwell, Back Bay, $16.99, 9780316017930

34. Guitar Zero
Gary Marcus, Penguin, $16, 9780143122784

35. The Four Agreements
Don Miguel Ruiz, Amber-Allen, $12.95, 9781878424310

36. Dancers Among Us
Jordan Matter, Workman, $17.95, 9780761171706

37. Steal Like an Artist
Austin Kleon, Workman, $10.95, 9780761169253

38. How to Be a Woman
Caitlin Moran, Harper Perennial, $15.99, 9780062124296

39. Below Stairs
Margaret Powell, St. Martin's Griffin, $14.99, 9781250023216

40. An Invisible Thread
Laura Schroff, Alex Tresniowski, Howard Books, $14.99, 9781451648973

41. Just Kids
Patti Smith, Ecco, $16, 9780060936228

42. Turn Right at Machu Picchu
Mark Adams, Plume, $16, 9780452297982

43. Meatless
Martha Stewart Living Magazine, Clarkson Potter, $25, 9780307954565

44. The Untethered Soul
Michael A. Singer, New Harbinger, $16.95, 9781572245372

45. Lucky Peach, Issue 6
David Chang (Ed.), McSweeney's , $12, 9781938073465

46. When I Was a Child I Read Books
Marilynne Robinson, Picador, $15, 9781250024053

47. Destiny of the Republic
Candice Millard, Anchor, $16, 9780767929714

48. Gifts of the Crow
John Marzluff, Tony Angell, Atria Books, $15, 9781439198742

49. Crossing the Borders of Time
Leslie Maitland, Other Press, $17.95, 9781590515709

50. Why We Write
Meredith Maran (Ed.), Plume Books, $16, 9780452298156