This post is an excerpt from New Visualization Tool from Google With Data From 5.2 Million Digitized Books.
Take the word "farking" that I used above. Usage of the word has risen and fallen over the years, skyrocketing not surprisingly once it became the curse-du-jour in the reprised Battlestar Galactica series. If that's too pedestrian, compare the changing usage for spaceship, spacecraft, rocket, and UFO. Or the frequency of communism, anarchism, socialism, and capitalism over the course of the twentieth century. Or the decline of man.
