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Upon learning of a red snowfield in the Swiss Alps, the American Naturalist reported that a Mr. Shuttleworth “betook himself thither” with his microscope and declared the color due to tiny animalcules.

He owed all of this to one thing: His cutting edge microscopes and their ability to study "animalcules," as bacteria were then called.

The last time this tiny wheel animalcule was moving around, wooly mammoths roamed the earth.

Stentors — or trumpet animalcules — are a group of single-celled freshwater protozoa.

But research has shown that this community of “animalcules” that live in our bodies can be changed, and in relatively short time - in ways both good and bad.