Over the last 15 years, two of the world's most high-profile CEOs, Elon Musk and Jeff Bezos, have been engaged in a simmering rivalry.
The two execs have sparred over their respective space ambitions - Musk runs SpaceX, while Bezos owns Blue Origin - but it hasn't stopped there: Musk has called out Bezos for running what he deemed a monopoly, and has called Bezos a copycat for his self-driving car interests. READ MORE