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The Number 1999
1999 is a Centered Triangular Number.
The Year 1999 ADIn the year 1999 AD Scientists measured the fastest wind speed ever recorded on earth, 509 km/h(318 mph).In the year 1999 AD Tekno Bubbles were patented. In the year 1999 AD the full Taniyama-Shimura conjecture is proved. In the year 1999 AD the Chemical Element Ununquadium was discovered by Joint Nuclear Research Institute at Dubna.
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