I've talked in the past about the possibilities for wireless power transmissions. DARPA has achieved this - by sending 800 watts of power over a distance of 5 miles!
The pulse was transmitted with an approximate 20% efficiency, and some of the power it transmitted was used to make popcorn. The researchers have bigger ambitions for the system's use in the field, however, suggesting that it could be used to power unmanned aerial vehicles (UAVs).
Popcorn. Seems so innocent, given that this is an advanced research branch of the army.
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