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seen Apr 19 at 12:07

Jan
3
awarded  Editor
Jan
3
revised When exactly is a CAPTCHA system a good idea?
added 10 characters in body
Jan
3
answered When exactly is a CAPTCHA system a good idea?
Jan
3
answered What are the possible channels and methods for sharing content with only one person from an iPhone app?
Dec
31
awarded  Teacher
Dec
31
answered Traffic lights: why yellow before green?