99.999 percent of microbe species have yet to be discovered, say scientists.

Earth could contain 1 trillion microbial species, but humans only know about 0.001 percent of them, two biologists from Indiana University suggest in a paper published Monday in Proceedings of the National Academy of Sciences. "We've done a pretty good job of cataloguing macrobes. Maybe every few years you'll hear about a new worm at the bottom of the ocean, but the rate we are exploring new [plants and animals] is slowing down," Jay Lennon, a microbial biology researcher at...

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