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Today in bio lab, we did an experiment to see how fast an STD can spread. The prof made 1 test tube that was "infected" and we each took our own test tube and mixed contents with just two other people. By the end of the experiment, 6 other test tubes were "infected" (That was half the class!) The way we could tell if we were "infected" was by putting a drop of a reactant into our test tube. If it turned pink, you were infected.

Lesson? Use condoms.