Malaria
Malaria most likely is the the greatest killer of humans in history. Even today, the World Health Organization estimates that it kills 2.7 million people a year; WHO says that it kills 2,800 children a day
The tragedy is that malaria is entirely preventable. After World War II, it disappeared almost entirely thanks to the use of DDT. However, with the banning of that pesticide, malaria has made a comeback.
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