Petra was the impressive capital of the Nabataean kingdom .

Deep within the deserts of Jordan lies the ancient city of Petra. Through a narrow gorge it emerges into view, revealing awe-inspiring monuments cut into the surrounding cliffs. What is this astonishing city? Who built it, and why?

Two thousand years ago, Petra stood at a crossroads of the ancient near east .Camel caravans passed through, loaded with spices, textiles and incense from distant regions--and through such commerce, the city flourished. Its people, the Nabataeans, harnessed precious water, enabling the population to soar to perhaps 20,000.
The Nabataeans also erected monumental tombs, memorializing their kings and leaders. But over time political control changed, and so did trade routes. Eventually the city fell silent, forgotten by the outside world.

The Atomic Bombing of Hiroshima

At approximately 8.15am on 6 August 1945 during world war a US B-29 bomber dropped an atomic bomb on the Japanese city of Hiroshima, instantly killing around 80,000 people. Three days later, a second bomb was dropped on Nagasaki, causing the deaths of 40,000 more. The dropping of the bombs, which occurred by executive order of US President Harry Truman, remains the only nuclear attack in history. In the months following the attack, roughly 100,000 more people died slow, horrendous deaths as a result of radiation poisoning.
Since 1942, more than 100,000 scientists of the Manhattan Project had been working on the bomb’s development. At the time, it was the largest collective scientific effort ever undertaken. It involved 37 installations across the US, 13 university laboratories and a host of prestigious participants such as the Nobel prizewinning physicists Arthur Holly Compton and Harold Urey. Directed by the Army's chief engineer, Brigadier General Leslie R. Groves,

1st may International Workers' Day .

The history of the world holiday on the 1st May - May Day, or International Workers Day, held in commemoration of four anarchists executed for struggling for an 8-hour day.Haymarket affair in Chicago. The police were trying to disperse a public assembly during a general strike for the eight-hour workday, when an unidentified person threw a bomb at them. The police reacted by firing on the workers, killing four demonstrators. "Reliable witnesses testified that all the pistol flashes came from the center of the street, where the police were standing, and none from the crowd. Moreover, initial newspaper reports made no mention of firing by civilians. A telegraph pole at the scene was filled with bullet holes, all coming from the direction of the police.

Originally a pagan holiday, the roots of the modern May Day  are in the fight for the eight-hour working day in Chicago in 1886, and the subsequent execution of innocent anarchist workers. In 1887, four Chicago anarchists were executed; a fifth cheated the hangman by killing himself in prison. Three more were to spend 6 years in prison until pardoned by Governor Altgeld who said the trial that convicted them was characterised by "hysteria, packed juries and a biased judge". The state had, in the words of the prosecution put "Anarchy is on trial" and hoped their deaths would also be the death of the anarchist idea.

21st February International Mother Language day.

 

Cairn for martyr of 1952 at Bangladesh

International Mother Language day was proclaimed by the General Conference of the United Nations Educational, Scientific and Cultural Organization (UNESCO) in November 1999. International Mother Language Day is celebrated every year on 21st February. The main purpose of celebrating this day is to promote the awareness of language and cultural diversity all across the world. The date represents the day 21st February 1952 when four young students were killed in Dhaka, the capital of Bangladesh, because of Bengali and Urdu language controversy. In 1947 at the time of partition of Pakistan,