There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
The richest black man in South Africa, the billionaire with the European appearance Johann Rupert has turned a part of the father's company into the business shining in every sense. Compagnie Financiere Richemont headed by him develops luxury brands of jewelry, watches, and clothes, increasing sales every year.