Can the dumbest brain outsmart the smartest computer?

Sounds impossible, does not it? But this is what a bunch of CAPTCHA researchers are trying to solve. Image recognition software used by spam bots is helping solve the challenge. There needs to be something, either a visual or sound, that would be computaionally hard for a computer to decipher but easy for the dumbest brain out there. Users already have a tough time keeping up with their passwords. The last thing they would need is to solve a puzzle to sign up for an email account!