SORU: aşağıdaki parçaya göre cevaplayınız
It is stated in the passage that ----.
For fifty years, scientists have been trying to create tiny
gadgets that travel around a patient’s bloodstream,
detecting and even fixing diseases. But how to power
them has been a problem. Formerly-used batteries have
shrunk over the years but have not been miniaturized
sufficiently to fit into a medical device small enough to
travel through veins and arteries. So instead of using
them, engineers at Stanford University have developed
tiny implants that can be powered by radio waves
beamed from a transmitter outside the body. The idea of
using electromagnetic waves to transfer power to
implantable medical devices is not new, and in principle,
it sounds simple. A transmitter outside the body emits
radio waves travelling through the tissues. They are
then picked up by an antenna on the internal device
where they induce a voltage. The trouble is, scientists
previously thought that radio waves would struggle to
get through human tissue. But a researcher at Stanford
University found strong evidence that they do pass
through. He used a chunk of beef as a stand-in for
human flesh and found that sufficient energy moved
through it to make electromagnetic power transfer
feasible. Already, working prototypes that can propel
themselves have been developed, but the distance
through which power can be transferred inside the body
still needs improvement