Imagine a device, which once pointed at someone's skull, makes him hear sounds in his mind, any sound, music or words And only him hears it http://www.thelivingmoon.com/47john_lear/04images/Sonic/hypno2s.gif http://www.thelivingmoon.com/45jack_files/03files/Sonic_Projection.html It's called a v2k https://fas.org/sgp/othergov/dod/vts.html ...