ever been too far away from a radio to consciously hear it then as you approach it notice it has the same jingle/topic you were thinking, pretty much the same thing but bypassing the ears. and this is just one application
The U.S. military has a weapon that can create human speech out of thin air
the Department of Defense has also developed what it calls a Joint Non-Lethal Weapons Program (JNLWP), whose purpose is to create weapons and other contraptions that can incapacitate but not kill their targets, reports
One device that the lab is making is an energy weapon that can use lasers to create the Laser-Induced Plasma Effect, which allows it to alter atoms and create words out of thin air. For now, it makes strange human-like sounds, but intelligible words are coming within the next three years. The goal is to have the weapon create particular noises or heat at distant points in space. Anyone between the weapon and the place where it creates this effect would be unaffected. The current range of such a blast is projected at “tens of kilometers”.
This weapons system is comprised of a femtosecond laser that can shoot bursts of focused light for around 10-15 seconds and a second nano-laser. The first laser rips electrons from air molecules and creates a plasma ball, which is then hit by the second laser, tuned to a very specific range of wavelengths. In this way, the device can control the plasma field, producing lights and increasingly more clear noises.
bigthink.com/paul-ratner/the-us-military-has-a-weapon-that-can-create-human-speech-miles-away
Magnetic fields can control heat and sound
Heat, sound… and magnetism?
In the March 23 issue of Nature Materials, we offer experimental proof that sound waves do interact with external magnetic fields.
What can we do with these results?
At this point, we’ve just described a new concept, something that had never been thought of before. Engineers can perhaps use this concept to control heat and sound waves magnetically. Sound waves can be effectively steered already by using multiple sources of sound, as is done in ultrasound imaging systems, but controlling heat conduction is much harder.
theconversation.com/magnetic-fields-can-control-heat-and-sound-39154
