An immersive experience at the Peter Harrison Planetarium at the Observatory in Greenwich, London. Photograph: © National Maritime Museum, London

Travel broadens the mind, and what better way to see the big picture than a trip away to learn more about the Universe. If your journey takes you to L(...)

Brothers Cameron (left) and Tyler Winklevoss talk to each other as they attend a New York State Department of Financial Services (DFS) virtual currency hearing in New York in January. In a blog post, the Winklevoss brothers said they used bitcoins to buy tickets for a high-altitude voyage on billionaire Richard Branson’s Virgin Galactic commercial spaceflight venture. Photograph: Lucas Jackson/Reuters

You can’t spend bitcoins at Amazon. com or to pay your mortgage but, as the Winklevoss twins showed, you can use the digital currency to book a(...)