4 may 1997 Garry Kasparov lost the second game of the chess computer IBM Deep Blue. The first match between a grandmaster and a supercomputer took place a year earlier, on 10 February 1996 in Philadelphia, and then Kasparov won 4-2.
Garry Kasparov vs Deep Blue in 1997
The 1997 was officially registered as the first case of computer chess victory over a grandmaster. Since then, two decades had passed, and in 2016, the computer beat human in Go, a game more complex than chess, from the point of view of logic.
And in this day…
4 may 1536 by a Florentine merchant Francesco Lapi was first used in the letter, the @sign. Date of letter established with certainty, but about the reason for the use of the symbol is derived a hypothesis. In 2000, Professor Sapienza, Giorgio Stabile claimed that the letter mentioned the price of one “A” of wine, and letter “A” was adorned with curl and clearly looked like @. Stabile suggested that it was the abbreviation of the unit of measurement of the volume of a standard amphora.
The modern “dog”
However, after 9 years date of first mention “dog” in the letter was revised. In 2009, the Spanish historian Jorge Romance found the @ symbol in the Aragonese manuscripts Taula de Ariza, dated 1448 year. Nearly a century before the Florentine letters. In Spanish, Portuguese, French the @ symbol traditionally means the restaurant is an old measure of weight equal to 11,502 kg (Aragon 12.5 kg). Today in English, the @ sign is equivalent to the Union at, and in Russian it is not used.
4 may 1884, made the first photograph of a lightning flash. The zipper and now requires some photographic skill and great fortune, and at the end of the XIX century it was akin to a miracle. The author was an American by the name Gurli, a member of the Marietta Observatory in Ohio.
It looks like modern the of lightning, the original clearly looked modest
Lightning flashed in the distance about three miles from the photographer, but the original has not survived. Or, at least, was not published in the Network.