It is estimated that there are  5×1030 bacteria on Earth. That's 5,000,000,000,000,000,000,000,000,000,000, or 5 nonillion. We have not even begun to identify them all, and new strains are evolving all the time. We not only coexist with bacteria on Earth, they outnumber us by such a mind-boggling degree that we cannot even conceive it. Consider this: There are currently just over 7 billion humans on earth, and one spoonful of rich soil contains approximately 10 trillion bacteria. And our bodies? Bacterial cells outnumber human cells 10 to 1. (But don't worry, you're not a zombie. They make up only 3% of our body mass. But still.)

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