MIT researchers have developed needleless shots like the ones administered by Dr. McCoy, and it's cool technology:

"The injector is built around a Lorentz-force actuator--a small, powerful magnet surrounded by a coil of wire that's attached to a piston. When the system is charged, it interacts with the magnetic field to produce a force that pushes the piston forward. This force ejects the drug at a pressure and velocity strong enough to get through skin, but supposedly feels no worse than a mosquito bite."
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