From Wikipedia, the free encyclopedia, Encyclopædia Britannica, Inc. CD of 2000 and the UFOs
sightings from various mentioned sources
Note: Dates for inventions are often
controversial. Inventions are often invented by several inventors around the
same time, or may be invented in an impractical form many years before another
inventor improves the invention into a practical form. Where there is
ambiguity, the date of the first working version of the invention is used here.
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