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 first computer was invented by Charles Babbage in 1838. He developed a mechanical calculator that had a simple storage mechanism and called it the Difference Engine. The device used punch cards to input instructions to the device steam engine as its source of power.