Both these effects reduce the workload of the heart, so beta blockers are of value in treating the symptoms of angina pectoris, the chest pain brought on by narrowing of the coronary arteries that causes inadequate delivery of oxygen-rich blood to the heart muscle.
3 1. The invention and the history of the Dell computer is quite interesting. First of all, it was in 1984 when Michael Dell, a student at the University of Texas at Austin, created the company PC's Limited. He only had a starting capital of $1,000.
WHO invented the first computer? The answer will surprise you: it was Charles Babbage, in the year 1832. Babbage, who was born in London in 1791, was a great mathematical genius. He was a natural inventor, and invented all sorts of new products. When he finished school, he went to study mathematics at Cambridge University.