Science: Microscopic UFOs

During a study of air pollution in 1968, two researchers using an electron microscope at the Atomic Energy Research Establishment at Harwell, England spotted strange polyhedron-shaped particles, each only .00002 inches across. Uncertain whether they were looking at a new form of life or merely a speck of soot, the scientists spent a year trying to identify the airborne organisms. They enlisted the aid of a dozen outside research institutes. Last November, still unable to identify their discovery, they described it in a paper published in Nature, and asked the world's biological community to help solve the puzzle.

The correct solution was...

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