The door-in-the-face technique uses large requests to gain smaller agreements.

The Assyrian Empire was known for psychological warfare tactics.

Priming — brief exposure to a stimulus — unconsciously influences later responses.

Sonoluminescence is the phenomenon where ultrasonic sound waves in liquid cause tiny bubbles to implode and emit flashes of light.

Humans have a negativity bias — negative events have stronger psychological impact than equally positive ones.

People with higher IQs often recognize patterns more quickly.

Terror management theory suggests much of human behavior is unconsciously driven by fear of death.

Hydraulic fracturing (fracking) uses pressurized liquid to crack rock formations and release oil or gas.

The placebo effect can produce real physiological changes.