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Comets Lemmon and PanSTARRS Peaking

Image Credit & Copyright: Yuri Beletsky (ESO)Explanation: Two impressive comets will both reach their peak brightness during the next two weeks. Taking advantage of a rare imaging opportunity, both of these comets were captured in the sky...

Understanding CAPTCHA and its purpose

CAPTCHA is a contrived acronym for – “Completely Automated Public Turing test to tell Computers and Humans Apart”.
A CAPTCHA is a challenge-response test (most often placed within web forms) to determine whether the user is human or a computer application.