Have you ever caught someone drinking straight out of the milk carton? Does saliva really wash back into the milk carton from your mouth when you take a drink? Test it for yourself at home using powdered drink powder and see what happens. Step by step instructions and guided scientific questions are available at Science-u.org. Then watch our ScienceU campers test for the amount of bacteria in milk samples when they drank directly from the carton and when they used a cup.

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