(biology) A hypothesis in evolutionary biology that explains selective altruism among individuals of a species, involving preferential treatment of individuals with certain characteristics.

(psychology) The tendency to more easily recognize members of one's own race.

A polar mirage caused by high refraction of sunlight between atmospheric thermoclines.

(poker) The maximum amount of chips in one's stack that is able to be wagered, after all the possible bets, raises and reraises.

plural of effective stack size

(psychology) An effect observed in fighter aircraft pilots, where horizontal acceleration at more than 1 standard gravity causes extreme stimulation of the vestibular system and leads to the faulty perception that the aircraft is climbing.

The transfer of nuclear spin polarization from one nuclear spin population to another via cross-relaxation.

(psychology) A cognitive bias by which an unskilled individual suffers from illusory superiority, mistakenly rating their ability as much higher than it actually is.

The phenomenon whereby genetic recombination allows evolution to progress more quickly.

The phenomenon that poets are more susceptible to mental illness than other creative writers.