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.
Charles Babbage was the first person to introduce the idea of programmable machines. Charles Babbage hardly imagined that his distaste for human errors would one day result in inventions such as desktop computers and laptop computers. The Atanasoff-Berry Computer (ABC) designed in 1937 was the name of the first computer. REF:http://www.buzzle.com/articles/who-invented-the-computer.html abhigna.p.v.