Based on sales for the week ending January 6, 2013

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

17. Lady Almina and the Real Downton Abbey
The Countess of Carnarvon, Broadway, $15.99, 9780770435622

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

19. Catherine the Great
Robert K. Massie, Random House, $20, 9780345408778

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

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

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

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

24. Arguably
Christopher Hitchens, Twelve, $18, 9781455502783

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

26. Rin Tin Tin
Susan Orlean, S&S, $16, 9781439190142

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

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

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

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

31. The Best American Essays 2012
David Brooks, Robert Atwan (Eds.), Mariner, $14.95, 9780547840093

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

33. How to Think More about Sex
Alain de Botton, Picador, $16, 9781250030658

34. The Emotional Life of Your Brain
Richard J. Davidson, Plume, $16, 9780452298880

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

36. Born to Run
Christopher McDougall, Vintage, $15.95, 9780307279187

37. The Science of Yoga
William J. Broad, Bobby Clennell (Illus.), S&S, $16, 9781451641431

38. 1493
Charles C. Mann, Vintage, $16.95, 9780307278241

39. The 5 Love Languages
Gary Chapman, Northfield, $14.99, 9780802473158

40. Cocktail Hour Under the Tree of Forgetfulness
Alexandra Fuller, Penguin, $15, 9780143121343

41. The Glass Castle
Jeannette Walls, Scribner, $16, 9780743247542

42. The Greater Journey
David McCullough, S&S, $20, 9781416571773

43. Eat to Live
Joel Fuhrman, Little Brown, $15.99, 9780316120913

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

45. Rand McNally 2013 Road Atlas
Rand McNally, $13.95, 9780528006227

46. Debt
David Graeber, Melville House, $22, 9781612191294

47. Boomerang
Michael Lewis, Norton, $16.95, 9780393343441

48. The Power of Now
Eckhart Tolle, New World , $15, 9781577314806

49. Jack Kennedy
Chris Matthews, S&S, $16.99, 9781451635096

50. Call the Midwife
Jennifer Worth, Penguin, $16, 9780143123255