Too Long; Didn't Read
We are all familiar with Google’s <a href="https://hackernoon.com/tagged/recaptcha" target="_blank">reCAPTCHA</a>, the small test that is meant to distinguish us from the machines. For many of us the reCAPTCHA challenge took a form of two scrambled words and we were asked to decipher both to be allowed to access a web page. <a href="https://hackernoon.com/tagged/google" target="_blank">Google</a> has released it 3 years after they began their quest to scan every book in the world. They had used a sophisticated OCR technology to accomplish this feat, however it wasn’t perfect. As one may suspect there were many small errors in the automatic transcribing process and it would be impractical to have people go over the text to find mistakes. Also at that time bots were starting to become a nuisance and a need to distinguish genuine users and bots become clear.