(cont'd from yesterday's post)
A bacterium is a one-cell organism, obviously lacking eyes and all other body parts that animals have, and even lacking a nucleus. Fifty of them lined up would cross the diameter of a human hair.
But inside them are those complex molecular machines, and they do amazing things.
Picture the bacteria living in a small, weedy pond. There's too much oxygen at the surface, so they need to stay toward the bottom where there's less. Having no eyes, how do they know which direction is the bottom?
Within these one-celled bacteria is a factory - yes, a factory - which manufactures magnetic crystals that are drawn toward earth's core. Watch the video to see how it works:
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