reCAPTCHA: 819 million hours of wasted human time and billions of dollars in Google profits

When you log into your bank's website, you might be presented with an image showing distorted numbers and letters and asked to enter them into a field to prove you're human. These tests, called CAPTCHAs (Completely Automated Public Turing test to tell Computers and Humans Apart), are commonly used on websites to prevent bot attacks and spam. — Read the rest
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