I'm sure you guys all know what re-captchas are(The captchas with 2 words)
I bet you didn't know that when you do those you are actually translating words from books into text.. For e-books.
Well. One of the words is just randomly generated.. But the other is scanned off of a book. So when you enter it, the thing saves it.
So if you get the randomly generated one right, and the other wrong.. It will still accept it!
Not really that useful but I thought it was cool, and why not share it? Haha..
I always just put my website in there to advertise it.