Scientists have found the answerA new study has shown that your kitchen sponge is a better incubator for a variety of bacteria than a laboratory Petri dish.Discuss
As the scientists explained, the sponge is such an attractive place for microbes, not only because of the fact that bits of food remain in it, but also because of its very structure. It must also be understood that some bacteria thrive in a diverse community. A physical environment that allows different species to live comfortably leads to the highest levels of biodiversity. A kitchen sponge provides just such an optimal environment.
Experiments by scientists have proven that a piece of kitchen utensil is indeed just as comfortable for germs as ordinary soil. The sponge mimics the varying degrees of separation found in soil, making it more efficient than any laboratory equipment.
Source: Futurity