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.
These are the worldâs top ten most richest black man for the year 2016. 10. Tony Elumelu. Tony Elumelu is one of the richest black man in the world. He has earned his substantial wealth from his stakes in the Union Bank of Africa, land and his controlling interest in Transcorp. The total assets of Tony stand at $1 billion and hefeatures in the tenth position in the list of most rich black men.