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.
Top 10 Richest Black People in the World 2016 net worth and income. Alhaji Aliko Dangote, (born 10 April 1957, Kano, Nigeria) is a Nigerian business magnate with an estimated net worth of $20.8 billion USD as of November 2013.