Recently, I’ve being playing around with the Google Ngram Viewer. This web service is currently in Google Labs and allows comparison of different words in books, allowing you to compare words and phrases. If you find an interesting time period you can click on a link to see the where the different trends are coming from in Google Books. Here are some interesting trends:
Hello vs. Goodbye
Hello (blue), goodbye (red).
Dollar (blue), yen (red), pound (green), euro (yellow), rupee (light blue), peso (pink), yuan (dark green), franc (aqua).
Europe (blue), Asia (red), North America (green), South America (yellow), Australia (light blue), Antarctica (brown), Africa (light green).
Art vs. Science
Art (blue),science (red).
Peace vs. War
Peace (blue), war (red).