Yes finding ways to kill bacteria is really helpful to mankind 🙂
Yes there are lots of bacteria that we know are helpful to humans – there are bacteria in our gut that help us digest our food.
The problem is that there are loads of other bacteria that are really dangerous to humans. Quite a few of the diseases that you hear about in the news like tuberculosis, meningitis and leprosy are all caused by bacteria. In the old days before antibiotics millions of people died every year because of bacteria that are now treated in a few days.
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