How $6 billion from Elon Musk could feed millions on the brink of famine

The Twitter showdown between Elon Musk and the head of the World Food Programme has made headlines around the world.

In October, David Beasley, head of the U.N. food agency, tweeted a cheeky congratulations to Musk for reportedly earning $36 billion in a single day. "1/6 of your one-day increase would save 42 million lives that are knocking on famine's door," he wrote.

A few days later, Musk tweeted: "If WFP can describe on this Twitter thread exactly how $6B will solve world hunger, I will sell Tesla stock right now...