Tech tycoons Mark Zuckerberg and Elon Musk recently used their respective social media platforms, Instagram and Twitter, to challenge the other to a cage fight in what most people see as a clever if bold piece of self-promotion by both to boost their profiles. But apparently the two billionaires are "dead serious" about meeting each other and slugging it out in the ring. But have they any idea what cage fighting is all about? It's generally regarded as one of the most brutal contact sports out there. And whatever their skill and experience, opponents can expect a good beating before anyone is declared a winner. But what exactly are the origins of cage fighting, and who are the sport's true champions?
Click through and find out what Musk and Zuckerberg can expect.