A region of space with extremely dense matter and gravity so strong that nothing, not even light, can escape from it.

The boundary around a black hole beyond which nothing, not even light, can escape.

The body's automatic physiological reaction to a perceived threat, preparing for confrontation or escape.

A unified theoretical framework in physics proposing that all string theories are different limits of one 11-dimensional model describing fundamental particles as vibrating membranes.

A laboratory-produced molecule engineered to bind to specific antigens, used in diagnostics, therapy, and research.

Universal principles that describe consistent behaviour of the natural world, independent of human opinion or culture.

An account of why or how a phenomenon occurs, grounded in natural laws, testable evidence, and logical reasoning, identifying underlying causes or mechanisms.