Human validation with an image

[Dennis Reinhardt]

> With thousands of registrations, you're going to have at least a few
> blind or visually-impaired users.  Bad move.  Instead, ask a question
> that requires intelligence to answer.

Arguably, there are more intelligence-impaired people than visually
impaired.  This whole challenge-response approach may be a bad move.

> (E.g. "What color is the sky?"

    black - night time
    white - cloudy day
    red - http://www.sunherald.com/mld/sunherald/news/nation/7495641.htm
    blue - clear day

The "intelligence" in such questions is often a matter of correctly modeling
what assumptions the questioner was making.

-- 
Dennis Reinhardt
DennisR at dair.com   http://www.spamai.com?ng_clp