"Bitcoin Accepted," said the sign at the makeshift lemonade stand, staffed by a serious tween. "Really?" "Yes," she said. "Will cash do?" She shrugged as I handed her $2, two classic greenbacks. "It's changing the world," she said. "Bitcoin." I had not set out that morning thinking I would soon be discussing a disruptive cryptocurrency with an entrepreneurial tween. Until that conversation, Bitcoin to me had been geekery tinged with stories that belong in novels: Bitcoin equalled mystery, money, and monkey business. Why? Three reasons: (1) Like bees to a honey pot, Bitcoin enticed screen-focused crypto-geeks to pay attention—some…
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