22h
If your teeth have ever felt fuzzy after skipping a brushing, you've encountered biofilm—a slimy bacterial layer that clings ...
Green Matters on MSN18h
Students Touch Bread Slices With Washed and Unwashed Hands. A Month Later, Here’s What the Bread Looks LikeOn being touched by clean and unclean hands and other school surfaces like Chromebooks, the resulting bread looked terrifying ...
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