Nairobi, July 29 -- "Nothing is more powerful than an idea whose time has come," said Victor Hugo.

Imagine you could tap into the next MPesa-like, market-dominating business idea. Can a struggling entrepreneur, wondering how to survive until month-end, learn from another who is out to build a self-sustaining human city on Mars? Do the six stages of idea quality determine the profitability of your business? Is Elon Musk right when he says artificial intelligence will exceed "the sum of all human intelligence" in about five years, and that "humans will no longer be in charge of the world in 10 years"?

Born in Africa, idea impresario Elon Musk, with an estimated net worth of about $695 billion - tied largely to his stakes in Tesla and Spac...