A Quote on Play and Evolution

My childhood play took me to extremes, and all of them, I now understand, were a fun way to test the social realities into which one is born. Surely this is a most important evolutionary function of play—finding out what is fun and fair or not fair on the field of life.

– Jaak Panksepp from the American Journal of Play, Winter 2010

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Cooperation precedes life

The existence of cooperating pairs of molecules in prelife is very plausible. Indeed, replication of a single strand of RNA can be thought of this way: one strand of RNA builds a complimentary strand, and so on. Thus cooperation is older than life itself.

Martin A. Nowak in his book Supercooperators.