Brain wave entrainment. At around 100 Hz, the brain releases beta endorphins. Beta endorphins are part of the body's endogenous opioid system. They're peptides that are 18 to 33 times more powerful than morphine on a per-molar basis.
They make you nice and mellow, and give you a feeling of contentment. You don't care about things that would normally concern you, much like heroin. They're part of the brain's reward system. Anyone who has ever been in a military hospital, pumped full of morphine with more added every two hours can tell you, there's not much that you're terribly worried about.
If you could somehow target the world's population with a constant 100 Hz hum, everybody would be releasing beta endorphins and there would be little chance that they'd muster up enough concern to rebel against authority. You could neuter their kids, make them eat bugs, and take away all their property, and chances are they wouldn't react.
And if you beamed it at them from satellites, they'd have a hard time discerning where it was coming from. Yeah, they'd all be nice and compliant. Then you could pummel their beta endorphin-drenched minds with complete BS through media outlets, and they'd swallow it all, hook, line, and sinker.
But who would want to do something like that? Surely there's no one here on Earth that sick, malevolent, and purely evil?
