One way water gets contaminated in 3rd world countries, is that since they do not have a toilet or latrine they do their business in a hole and soon it easily reaches the drinking water. It contains too much bacteria and viruses and that is the water people in 3rd country drinks.
The danger of water contamination is that more than 100's of people have died because of it.
There can be an invention of inventing toilets in the 3rd country from drinking contaminated water.
I think every one in the 3rd world do not have these inventions because they are poor and the governor there is greedy and doesn't want to spend much money.
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