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Depth perception can be upset when rules and knowledge are in conflict, as you can see in these short videos of well-known visual illusions.
"MTR passengers are to be the first in the world to enjoy wireless access to the internet on underground trains through a high-speed Wi-fi network."
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reCAPTCHA improves the process of digitizing books by sending words that cannot be read by computers to the Web in the form of CAPTCHAs for humans to decipher. ...Each word that cannot be read correctly by OCR is placed on an image and used as a CAPTCHA.
The WorldWide Telescope (WWT) is a rich visualization environment that functions as a virtual telescope, bringing together imagery from the best ground and space telescopes in the world for a seamless, guided exploration of the universe.
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