Gosh, can you imagine internet has about 1 trillion (1,000,000,000,000) unique URLs? At least I never thought that web could be so big. And these numbers come straight from Google, so no doubt about its authenticity. Actually, Google don't index every one of those trillion pages -- many of them are similar to each other, or represent auto-generated content. But still, a trillion is a very big number. Wondering what's the case with unique pages on the web? They're infinite.
[Via Google Blog]