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Hard
Swab bathroom door handles at six locations before and after a Clorox wipe. Count the bacterial colonies each cleaning removes.
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Transfer glowing bacteria into test tubes and watch their light fade as you add everyday pollutants like hair gel and river water.
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Expose creek water to UV light for up to 24 hours and count bacteria colonies at different lamp intensities.
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Collect saliva from 102 dogs and place it on E. coli lawns to measure how many samples create bacteria-free rings.
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Pit four household disinfectants against six species of bacteria and find out which cleaner leaves the fewest survivors.
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Test prescription and store-bought acne treatments against live bacteria to see which one creates the largest germ-free zone.
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Grow four generations of E. coli against three concentrations of disinfectant and track whether the bacteria-free zone shrinks over time.
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Swab dental retainers after no brushing, toothpaste brushing, and mouthwash rinsing to find out which method removes the most bacteria.
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Place disks soaked in three acne medications on bacteria plates and measure which one creates the largest bacteria-free zone.
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Soak paper disks in three antibacterial soaps and place them on bacteria to find which creates the largest clear zone.
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