I've encountered variations of the math captcha that say things like, 
"Write the colors in the following sentence" or "What is the third 
animal in the sentence below." Once I ran into one that asked a question 
we all know, like "What colors are in the U.S. flag." I suppose bots can 
eventually figure them out, but it's probably harder if the text is 
buried among other text.

Like Bill, I really like this method and wish it were more common.


On 4/30/2014 12:27 AM, Colin Howard wrote:
> The maths captia is a good idea, but botts would quickly learn the
> permutations if left in a standard format.
>
> However, say as an example the question is framed in one of the ways below,
> plus others of which I as yet have not thought:
>
> 3+15=
>
> Three plus fifteen equals
>
> 3 +15 =
>
> 3+ 15 =
>
> "3" + 15 "="
>
> . . .
>
> we can understand what is required, allowance needs be made to accept
> eighteen or 18, within and no quotes.
>
> Further, the site can pick up from whence the person is sending - i.e the
> States, Russia, U.K, France, Nigeria . . . then perhaps the captia could be
> questions the sender might be expected to know relating to the country from
> which they are sending.
>
> I am trying to think of something a UK citizen, or a UK visitor would be
> expected to know it is far more difficult than I thought!
>
> Sure you get the idea.
>
>


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