Digital currencies aren't just for geeks anymoreCash had a pretty good run for 4,000 years or so. These days, though, notes and coins increasingly seem declasse: They're dirty and dangerous, unwieldy and expensive, antiquated and so very analogue. Sensing this dissatisfaction, entrepreneurs have introduced hundreds of digital currencies in the past few years, of which bitcoin is only the most famous. Now governments want in: The People's Bank of China says it intends to issue a digital currency of its own...
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