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.
Richest Presidents in Africa. Africa is the second largest continent in the world. It is also worldâs second most populous continent and regarded as the poorest continent. There are 47 African nations led by leaders who have been ruling for over a decade. Some of these leaders and their families are very rich and their wealth are considered ill-gotten. They make their wealth from natural resources of these nations. The 8 Richest Presidents and Kings in Africa as of 2014: Country: Zimbabwe, Years in Power: 26. Robert Mugabe is the President of Zimbabwe. His net worth is estimated to be around $10 million according to Celebrity Net Worth.