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From mental_floss:
You probably know that bacteria are everywhere, but you might not be aware of just how many ways bacteria help us, just by eating.
For example, Geobacter sulfurreducens can be used to clean up toxic waste, because it is able to eat energy produced by unstable uranium particles. When the bacteria are finished, the end result is a solid, stable form of uranium that is much easier to clean up.
In some cases, a bacterium's diet is amazingly specific. One strain of Wolbachia, for example, only eats the gonads of the Aedes aegypti mosquito. While it doesn't destroy the reproductive organ, it does alter the course of reproduction in a way that prevents the mosquito from carrying the deadly Dengue virus.
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