Essential Tension

Part III addresses experimental studies of cooperation and competition, as well as controversial ideas such as the evolution of evolvability and Stephen Jay Gould's suggestion that "spandrels" at one level of selection serve as possible sources of variability for the next higher level.

Partea a III-a abordeaza studii experimentale de cooperare si concurenta, precum si idei controversate, cum ar fi evolutia evolutiei si sugestia lui Stephen Jay Gould ca „spandrels” la un nivel de selectie servesc ca posibile surse de variabilitate pentru urmatorul nivel superior.