In the test, it is verified that the random cyclic constitutive relations, like the wide recognized random cyclic strain-life relations, is an intrinsic fatigue phenomenon of engineering materials.

The problem is "decision fatigue", a psychological phenomenon that takes a toll on the quality of your choices after a long day of decision making, says Evan Polman, a leading psychologist.

He goes on to warn about the phenomenon of pair fatigue: When two programmers pair together, the things they notice and fail to notice become more similar.