Jerry
Preview
Open in TheBrain
Welcome! (start here)
Big Issues
Key Tech Issues
Economics
Demand
Buying
Acquisition
Acquisitions
Google Acquisitions
reCAPTCHA (2007)
Attachments
Stop Spam, Read Books
Parents
Captchas (2003 Completely Automated Public Turing test to tell Computers and Humans Apart)
Google Acquisitions
Children
Colin McMillen
Duolingo (2009)
Luis von Ahn
Luis von Ahn: Massive-scale online collaboration
reCAPTCHA