Recent discoveries, however, have such medgadgets being powered by photons, hip hop and now high-frequency radio waves.
ENGADGET: Stanford researchers make heart implant powered by radio waves, put batteries out of a job
That, they say, gives them access to more telling, high-frequency waves that say a lot more about cognitive intentions.
ENGADGET: Test subjects with electrode implants use mind control to move a cursor
Agarwal is in the early stages of further research that can model the human body's role in protecting from radio-frequency electromagnetic waves emitted from cell phones.
Because of the distance that low-frequency sound waves can travel under water, a set of four ships emitting sound at 235 decibels could monitor 80% of the world's oceans for submarines.
ECONOMIST: The American navy may soon have a whale of a problem
Although they have not been found to cause any harm, the cables on conventional pylons, which transmit a three-phase alternating current, generate a strong electric field and a continuous buzz of low-frequency radio waves.
That conundrum was solved by getting the high-frequency signals to penetrate deeper using alternating waves of electric and magnetic fields.
ENGADGET: Stanford researchers make heart implant powered by radio waves, put batteries out of a job
Defenders of high-frequency trading, in which firms send waves of buy and sell orders into the market, often canceling them, say it makes trading more efficient and cheaper for everyday investors.
The nuclear test monitors pick up "infrasound", or low frequency, waves from about 20 meteors a year -- "if conditions are right, perhaps as small as a pea, " she said.
Then, the waves' frequency is tweaked and the sample blasted head-on in order to heat it.
The radiation just spread out into space - where it still is and can be detected as weak waves of radio frequency.
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