If you're ever forgotten to dry the laundry for just a day or two, you can easily notice what your "clean" laundry starts to emanate. I think that's a simple e

If you're ever forgotten to dry the laundry for just a day or two, you can easily notice what your "clean" laundry starts to emanate. I think that's a simple enough experiment that confirms that "clean" laundry does have LOTS of bacteria, especially before it gets killed by removing the leftover water. Speaking of bacteria, another interesting at-home experiment is the one with tea. Not everyone knows, but tea is highly anti-bacterial. If you leave an old tea-bag from milk-free green tea lying around with just enough water to keep it moist for a few days or even a week, the chances of spoilage or mold are extremely low — the water will evaporate faster. (I sometimes didn't throw old tea cups from my desk for weeks, and none of them ever developed anything bad, unless they had something other than the tea, e.g., milk tea will develop mold pretty fast.)