Like her two younger brothers, 16-year-old Peyton Wolfe found what she'd wanted most under the family tree on Christmas morning: a hoverboard. "It was the gift to get," she said of the self-balancing gadget, which resembles a skateboard without wheels. Underscoring her point: On the Monday after Thanksgiving (popularly called Cyber Monday), eBay reported the sale of of 7,500 hoverboards — or one purchase every 12 seconds. Almost as rapidly as the devices sold, however, they have raised their share of safety concerns. Unexpected tumbles suffered by users, a spate of fires tied to overheating lithium-ion batteries and resulting bans in public places have all combined to cast the gadgets in a...
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