Self-contradictory statement denying its truth.

The productivity paradox refers to the slowdown in productivity growth in the United States in the 1970s and 1980s despite rapid development in the field of information technology over the same period.

In economics, the Leontief's paradox is that a country with a higher capital per worker has a lower capital/labor ratio in exports than in imports.

Time dilation affects traveling twin.

Alternative form of St. Petersburg paradox [(economics) The paradox raised by a particular (theoretical) lottery game that leads to a random variable with infinite expected value (i.e. infinite expected payoff) but nevertheless seems to be worth only a very small amount to the participants.]

Healthy despite high-fat diet.

Contradictory statement defying common sense.

(logic) A paradox arising from vague predicates and repeatedly applying a small difference. For example, removing one grain from a heap of sand still leaves a heap, yet removing enough grains will eventually not leave a heap.

The situation where a group of people collectively decide on a course of action that goes against the preferences of many or all of the individuals in the group, because the individuals choose to side with what they believe is the majority preference.

(relativity) The phenomenon in which two observers who start together with identical clocks, follow different timelines, and then rejoin can have different elapsed times on their clocks, especially if one travels at a relativistic speed.