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"Because the energy would jump only to a receiving device that resonates with the originating source, wireless energy transfer would be harmless to people, Soljacic says. 'The only energy that would go into free space is magnetic energy of the kind that human beings are around all the time,' he says, such as that given off by Magnetic Resonance Imaging (MRI) machines in hospitals or when high-speed magnetic levitation ('maglev') trains are suspended slightly above their tracks to cut friction.
"'We are fairly optimistic that the safety issues will be OK,' Soljacic says.
"But proving a new technology is safe can be a tall task, Saffo notes. 'Even if it's harmless, someone's got to test it and confirm it's harmless,' he says. 'We have a long history of consumers being very sensitive about things that the experts tell them are very safe, like food irradiation.'"
