Based on sales for the week ending January 9, 2011

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

17. NurtureShock
Po Bronson, Ashley Merryman, Twelve, $14.99, 9780446504133

18. Lit
Mary Karr, Harper Perennial, $14.99, 9780060596996

19. The King's Speech
Mark Logue, Peter Conradi, Sterling, $14.95, 9781402786761

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

21. The Big Burn
Timothy Egan, Mariner, $15.95, 9780547394602

22. The Man Who Loved Books Too Much
Allison Hoover Bartlett, Riverhead, $15, 9781594484810

23. The Omnivore's Dilemma
Michael Pollan, Penguin, $16, 9780143038580

24. Bicycle Diaries
David Byrne, Penguin, $16, 9780143117964

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

26. When Everything Changed
Gail Collins, Back Bay, $15.99, 9780316014045

27. Food Rules
Michael Pollan, Penguin, $11, 9780143116387

28. Resilience
Elizabeth Edwards, Broadway, $15, 9780767931564

29. The Lost City of Z
David Grann, Vintage, $15.95, 9781400078455

30. Traveling With Pomegranates
Sue Monk Kidd, Ann Kidd Taylor, Penguin, $15, 9780143117971

31. Eating Animals
Jonathan Safran Foer, Back Bay, $14.99, 9780316069885

32. Change Your Brain, Change Your Body
Daniel G. Amen, Three Rivers Press, $16, 9780307463586

33. When Things Fall Apart
Pema Chodron, Shambhala , $14, 9781570623448

34. Strength in What Remains
Tracy Kidder, Random House, $16, 9780812977615

35. The Cello Suites
Eric Siblin, Grove, $15.95, 9780802145246

36. Dewey
Vicki Myron, Grand Central, $13.99, 9780446407427

37. You Are Here
Thich Nhat Hanh, Shambhala, $14, 9781590308387

38. My Horizontal Life
Chelsea Handler, Bloomsbury, $14.95, 9781582346182

39. Clean
Alejandro Junger, HarperOne, $14.99, 9780061735332

40. Too Big to Fail
Andrew Ross Sorkin, Penguin, $18, 9780143118244

41. A People's History of the United States
Howard Zinn, Harper, $18.99, 9780060838652

42. The Best American Essays 2010
Christopher Hitchens, Robert Atwan (Eds.), Mariner, $14.95, 9780547394510

43. Are You There, Vodka? It's Me, Chelsea
Chelsea Handler, Simon Spotlight, $16, 9781416596363

44. Mindsight
Daniel J. Siegel, Bantam, $16, 9780553386394

45. Blink
Malcolm Gladwell, Back Bay, $15.99, 9780316010665

46. The CalorieKing Calorie, Fat & Carbohydrate Counter 2011
Allan Borushek, Family Health Publications, $8.99, 9781930448339

47. In Defense of Food
Michael Pollan, Penguin, $15, 9780143114963

48. The Devil in the White City
Erik Larson, Vintage, $15.95, 9780375725609

49. Shop Class as Soulcraft
Matthew B. Crawford, Penguin, $15, 9780143117469

50. Mountains Beyond Mountains
Tracy Kidder, Random House, $16, 9780812973013