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.
The envy of CEOs everywhere. By early 1985, at the age of twenty, Dell had thirty employees working for him. During the summer of that year, the company began producing the Turbo PC, its first computer made entirely from scratch, rather than a customized version of another company's machine. In 1987 Dell changed the name of the company from PCs Unlimited to Dell Computer Corporation. At that time he began a program offered by no one else in the industry: rather than having customers bring broken-down computers to a store for repair, Dell Computer would pay house calls to service its customers' PCs.