The Number 1999: Properties and Meanings1999 is a Prime Number.
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.