So, here's a cute trick I learned a couple of days ago (via Stellar:Interesting). Set up your web browser homepage to:
Then, whenever you open a new window or tab, it will redirect to a random Wikipedia article.
For example, did you know that Macropoliana afarorum is a moth from the Sphingidae family, or that it is known from Djibouti?
Well, if you had set up your homepage like this and then opened a new browser window a geometrically distributed number of times with a mean of about 30 million, you would have known it!