• Luis von Ahn
• Computer science professor, Carnegie Mellon University

• Speaking at PopTech 2009
• October 2009
• Camden, Maine

Harnessing brainpower: von Ahn invented ReCaptcha, a program that uses squiggly characters that humans easily decipher but blocks spambots – and helps digitize millions of old texts. The CMU professor also makes games that use human knowledge to improve computers. Find them at gwap.com .