I love reading about things billionaires mull over, just because they can. 
Like this from billionaire Elon Musk:

Like this from billionaire Elon Musk:
Los Angeles billionaire Elon Musk has already revolutionized spaceflight business for NASA. He has shaken up the automotive industry. Now he's turned his attention to public transportation.
On Monday, Musk wrote a blog post revealing the design of his much-anticipated Hyperloop, the proposed high-speed transit solution that
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I'd love to be able to go up to the Bay Area just whenever I feel like it, and be back later that same day. That's not something possible with driving or taking the train. And I don't fly any more!