At least talk to me about your American dream.

My dream has been, well it has switched.

I mean at first it was just to get an education.

At this point is to have a real impact in the world. The Louise Bonininne, what a pleasure seeing.

A pleasure being here, pleasure talking to you again.

Luis, you are responsible in no small part for part of something which for many of us really is frustrating when we're online.

And yet it's something that has really been revolutionary and has been so helpful.

Talk about capture and recapture.

I mean, if people haven't seen this, it's these distorted characters that you have to type all over the internet

whenever you're buying tickets on

Ticketmaster or getting an account on Facebook. Sometimes you're asked to type

these distorted characters. I invented that that thing is called a coucha and the

reason is there is to make sure that you are

actually a human and not a computer program that was written to submit that form.

And so how did you come up with this and what did you do with it?

Because I know that you did CAPCHA and then recapture,

which you later sold to Google.

Well, this started in the year 2000.

It all started.

I was a first year PhD student at Carnegie Mellon University and I went to a talk by a guy who at the time was the chief scientist of Yahoo. Now you got to understand in the year 2000 Yahoo was the biggest

internet company that there was. And he talked about a problem that they didn't know how to solve, which was there were people

who were writing programs to obtain millions of email accounts from Yahoo.

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