Latterly, the idea has been taken up by Silicon Valley luminaries and venture capitalists, some putting up money for the cause, as we shall see. They include Robin Chase, co-founder of Zipcar, Sam Altman, head of the start-up incubator Y Combinator, Albert Wenger, prominent venture capitalist, Chris Hughes, co-founder of Facebook, Elon Musk, founder of SolarCity, Tesla, and SpaceX, Marc Benioff, CEO of Salesforce, Pierre Omidyar, founder of eBay, and Eric Schmidt, Executive Chairman of Alphabet, Google's parent.