The human experience of feeling a sudden sense of insight upon making a discovery or realization.

The process by which a planet is heated by solar radiation which is retained by its atmosphere.

(ecology) The negative population growth observed at low population densities.

The technical notion of sensitive dependence on initial conditions in chaos theory.

(Britain) A secondary, often unintended effect; a repercussion, chain reaction.

Returning a benefit that justifies the initial investment; economical.

(physics) The visible scattering of light along the path of a beam caused by discontinuities such as suspended particles.

(physics) The tendency of alternating current to distribute itself in a conductor such that the current density is greater near the surface than near the core. The effect increases with frequency.

(physics) The energy of a heterogeneous (polychromatic) photon beam calculated as if it were monochromatic

(physics) an effect that arises from the relation between the angular momentum and the magnetization of a magnetic substance