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It uses lasers to beam power from one place to another, but it too faces regulatory difficulties.
ECONOMIST: Wireless charging
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By pressing the switch once, the light operates in high mode to produce a full power 130 lumen light beam with a long 4 hour runtime.
ENGADGET: Explosion-proof flashlight could be the first to outlive its owner
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The same approach has been used in ground-based experiments to beam one kilowatt of power over a distance of several kilometres, notes Peter Fisher, a physicist at the Massachusetts Institute of Technology.
ECONOMIST: Monitor
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It produced a beam with 300 terawatts of power (several hundred times the capacity of America's entire electricity grid).
ECONOMIST: Ultra-fast lasers
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In recent months the company recalled 572, 000 Honda Accords for power steering hose issues and 268, 000 CR-Vs for faulty power window switches and 820, 000 Civic and Pilot models for potential low-beam headlamp failures.
FORBES: Honda's Latest Recall: 800,000 SUVs and Minivans With Faulty Ignition Switches
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Solenoid beams have already proven their "tractor beam" abilities in laboratory tests published in the journal Optics Express, but the pulling power of Bessel beams, presented on the preprint server Arxiv in February, remains to be proved experimentally.
BBC: Nasa examines 'tractor beams' for sample gathering