In one corner is Mark Zuckerberg: 39 years old, five foot seven inches and, if his selfies are to be believed, a wizard at jiu-jitsu. In the other corner stands Elon Musk: 13 years older, six inches taller and considerably heavier, with a special move known as the walrus (“I just lie on top of my opponent & do nothing”). The two billionaires have agreed to a cage fight, with Mr Musk saying on June 29th that it might take place at the Roman Colosseum.
The bout may never happen. Neither the Italian government nor Mr Musk’s mother seems keen. But the new-media moguls are simultaneously
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