In 1905 – 110 acres of land in southern Nevada were auctioned off, founding a new city. They would become downtown Las Vegas which would grow to become the host for major tech events like Comdex, CES and more.
In 1987 – The Soviet Union launched the Polyus prototype orbital weapons platform from Baikonur Cosmodrome Site 250 in Kazakhstan. It failed to reach orbit. Polyus was designed to destroy SDI satellites with a megawatt carbon-dioxide laser.
In 2004 – Using a computer with a 2.4-GHz Pentium 4 processor, Josh Findley discovered the 41st Mersenne prime, 224,036,583 – 1. Mersenne primes have a close connection to perfect numbers, which are equal to the sum of their proper divisors.