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.
Quora User. 1  Aliko Dangote appears to be highest on the list of Forbes 500, with a net worth of $20.8 billion as of November 2013, making him Africa's richest man. There are a couple of Arab, South Asian and East Asian people higher up than him though, in among all the rich white dudes and ladies.