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Posted 8 years ago by boyt in category: funny   Comments (0)


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Prof. Walter Lewin
Posted 13 months ago by boyt in category: science   Comments (1)


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Can you spot the child in need of help before the lifeguard does?
Posted 1 year ago by boyt in category: important   Comments (6)



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Posted 3 years ago by wandat in category: science   Comments (4)


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Posted 1 year ago by boyt in category: technology   Comments (0)