(physics) The black hole information paradox.

Synonym of paradox of thrift

(game theory) The paradox whereby a combination of losing strategies (such as alternating between two games that each, played individually, would result in an overall loss) may give a winning strategy.

(probability theory) The counterintuitive observation that a random group of people needs to have only 23 members before there is a 50% chance of two of them having the same birthday.

plural of paradoxical frog

(economics) The apparently paradoxical observation that people's reported happiness varies directly with income both among and within nations, but over time happiness does not trend upward as income continues to grow.

Pseudis paradoxa, a species of frog unusual because it is larger as a tadpole (up to 25 cm or 10 in. long) than as an adult (about a quarter of that length).

The observation that the French suffer a relatively low incidence of coronary heart disease, despite having a diet relatively rich in saturated fats.

The observation that the association of two variables for one subset of a population may be similar to the association of those variables in another subset, but different from the association of the variables in the total population.

plural of grandfather paradox