The brain's normal pain-sensory system, in which nerve endings send messages to the brain about a threat, goes awry in migraines.

WSJ: Fresh Target in Hunt for a Migraine Cure

The reasonable investor, like the reasonable person in other tort suits, is an invention of the U.S. court system who generally possesses the extra-sensory power to detect, in advance, every bad outcome that might come from a certain course of action.

FORBES: 'Pro-Business' Supreme Court Defies Critics Again

The unpleasant feedback from exercising, such as difficulty breathing, sweating or stiff muscles, is transferred to the brain using the afferent, or sensory, nervous system.

WSJ: Optimal Music for the Gym

Malcolm MacIver and colleagues at Northwestern University have created an "artificial electric-field sensing system that could ultimately give robotic subs the same additional sensory capabilities" as found in weakly electric fish.

ENGADGET: Robotic submersibles take on fish-like sensing abilities