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Additional info for How It Works, Issue 86, 2016
Sample text
Bot spotting is an arms race between websites and spammers Distorted text is designed to catch robot spammers 052 | How It Works W hen you register at a new website, the line of wavy or distorted text that you have to type in is called a CAPTCHA. This stands for Completely Automated Public Turing test to tell Computers and Humans Apart and it’s designed to prevent automated ‘bot’ programs from spamming users with hundreds of fake accounts. A CAPTCHA is supposed to be easy for a human, but difficult for computers.
Receptors within muscles and tendons constantly monitor the body’s movement and position. These receptors send reflex signals (which bypass the brain) to protect the muscles from potential damage. One reflex encourages muscle contraction, to prevent overstretching, while the other promotes relaxation to control tension. These reflexes are normally balanced, but can be disrupted so that the contraction signal overwhelms the relaxation one, resulting in the unexpected, intense and painful muscle spasm of cramp.
This stands for Completely Automated Public Turing test to tell Computers and Humans Apart and it’s designed to prevent automated ‘bot’ programs from spamming users with hundreds of fake accounts. A CAPTCHA is supposed to be easy for a human, but difficult for computers. In 2003, when CAPTCHA was invented, reading text against a busy background was insurmountably hard for bots. 8 per cent accuracy, which is actually better than humans! More advanced CAPTCHAs now ask you to click on all the pictures of dogs in a grid of animal snaps, or identify whether a basketball, rugby ball or ice cream should go with the picture of a basketball hoop.