No more CAPTCHA
CAPTCHA has become a standard device to trap and block spam on sites like this one.
The idea is that if someone writes a computer program to drop spam comments on this blog, the computer program will be asked to solve a problem first. That problem (like “what letters are below in this squiggly image?” or “what’s 4+12?”) is not Turing-computible. So only a human being will solve it.
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