
Microbes are the oldest living organisms on the planet. They have been around for billions of years. Why haven't you seen them, then? Microbes are tiny, single-celled organisms--millions could fit in the eye of a needle. You might think of microbes as organisms that make us sick...

Microbes are the oldest living organisms on the planet. They have been around for billions of years. Why haven't you seen them, then? Microbes are tiny, single-celled organisms--millions could fit in the eye of a needle. You might think of microbes as organisms that make us sick...