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 fact that Nigerian, Aliko Dangote is Africaâs richest man according to Forbes 2011 Rich List doesnât mean he is the richest in Africa. Forbes list is made up of billionaires who gave access to their personal finances and assets. (1). (2).