Books Scott Citron Books by Scott Citron Scott Citron has written books about: Nonfiction Science & Health Facebook Twitter Google+ Email NPR stories about Scott Citron Vincent Liota Krulwich Wonders... Getting Slower And Slower: How Slow Can You Go? September 21, 2012 Usain Bolt is the fastest human on Earth, but the average sneeze is more than three times faster. And everyone knows that snails are sluggish, but how do they compare to the speed of a growing fingernail? Gilles Chapdelaine/NASA & ESA Krulwich Wonders... Which Is Greater, The Number Of Sand Grains On Earth Or Stars In The Sky? September 17, 2012 Scientists have estimated the answer to this age-old question. However, the vastness of these big, big numbers can be limited by our human perspective. Robert Krulwich/NPR Krulwich Wonders... That Old Rice-Grains-On-The-Chessboard Con, With a New Twist September 15, 2012 An old fable tells the story of a naive king, duped by a clever craftsman. But perhaps the king used his own math savvy to outcon the con man.