This comes from a recent TED video on Googlelabs' Ngram Viewer. Google has digitized ~5 million books and allows users to search the entire text to find the frequency with which words are mentioned. If one were curious about the relationship in literature between 'gold' and 'depression', one could find out. Or the rise and fall of presidents. The birth of strategies. The popularization of cliches. The literary history of 'arbitrage':
On and on and on.
On and on and on.
