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.
#1) The Richest Black Man in the World â Aliko Dangote. Topping this list is Aliko Dangote. Born in Kano which is in the country of Nigeria, Mr. Dangote is the President and CEO of Dangote Group. He is also the founder of this company.