>Mr Musk has gone further still. Rather than using his business wealth to support philanthropy in an unrelated area, he runs two giant companies, Tesla (a clean

>Mr Musk has gone further still. Rather than using his business wealth to support philanthropy in an unrelated area, he runs two giant companies, Tesla (a clean-energy firm that sells electric cars) and SpaceX (which builds the Falcon rockets), that further his ambitious goals directly. Well, by launching many rockets burning hundreds of tons of kerosene each, SpaceX kinda offsets Tesla's clean energy efforts.