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Igor returned to Kiev keen for revenge. He assembled a large force of warriors from among neighboring Slavs and Pecheneg allies, and sent for reinforcements of Varangians from "beyond the sea." In 944 the Rus' force advanced again on the Greeks, by land and sea, and a Byzantine force from Cherson responded. The Emperor sent gifts and offered tribute in lieu of war, and the Rus' accepted. Envoys were sent between the Rus', the Byzantines, and the Bulgarians in 945, and a peace treaty was completed. The agreement again focused on trade, but this time with terms less favorable to the Rus', including stringent regulations on the conduct of Rus' merchants in Cherson and Constantinople and specific punishments for violations of the law. The Byzantines may have been motivated to enter the treaty out of concern of a prolonged alliance of the Rus', Pechenegs, and Bulgarians against them, though the more favorable terms further suggest a shift in power.

IN what year was the peace treaty signed between the Rus, Byzantine and the Bulgarians.
Answer: 945
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IBM was among the first corporations to provide group life insurance (1934), survivor benefits (1935) and paid vacations (1937). In 1932 IBM created an Education Department to oversee training for employees, which oversaw the completion of the IBM Schoolhouse at Endicott in 1933. In 1935, the employee magazine Think was created. Also that year, IBM held its first training class for female systems service professionals. In 1942, IBM launched a program to train and employ disabled people in Topeka, Kansas. The next year classes began in New York City, and soon the company was asked to join the President's Committee for Employment of the Handicapped. In 1946, the company hired its first black salesman, 18 years before the Civil Rights Act of 1964. In 1947, IBM announced a Total and Permanent Disability Income Plan for employees. A vested rights pension was added to the IBM retirement plan. During IBM's management transformation in the 1990s revisions were made to these pension plans to reduce IBM's pension liabilities.

In what year did IBM begin to provide group life insurance?
Answer: 1934
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Muslim scientists contributed to advances in the sciences. They placed far greater emphasis on experiment than had the Greeks. This led to an early scientific method being developed in the Muslim world, where progress in methodology was made, beginning with the experiments of Ibn al-Haytham (Alhazen) on optics from circa 1000, in his Book of Optics. The most important development of the scientific method was the use of experiments to distinguish between competing scientific theories set within a generally empirical orientation, which began among Muslim scientists. Ibn al-Haytham is also regarded as the father of optics, especially for his empirical proof of the intromission theory of light. Some have also described Ibn al-Haytham as the "first scientist." al-Khwarzimi's invented the log base systems that are being used today, he also contributed theorems in trigonometry as well as limits. Recent studies show that it is very likely that the Medieval Muslim artists were aware of advanced decagonal quasicrystal geometry (discovered half a millennium later in the 1970s and 1980s in the West) and used it in intricate decorative tilework in the architecture.

Ibn al-Haytham wrote about his work around the year 1000, what was it?
Answer:
Book of Optics