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 Patrice Motsepe, the founder and executive chairman of African Rainbow Minerals (ARM) is often referred to as South Africaâs first black billionaire and the wealthiest black man in South Africa. 2  Motsepe has a net worth of $2.5 billion (R32 billion). Cyril Ramaphosa, Motsepeâs brother-in-law and South Africaâs current deputy president, is the first billionaire deputy president in the post-apartheid South Africa. 2  He is the founder and former executive chairman of Shanduka Group, an investment holding South African firm. 3  His net worth is $550m (R6bn).