Knowledge becomes culture when one generation refuses to make the next rediscover everything alone.

A culture is largely a mechanism for not starting from nothing. When one generation writes down, tells, and teaches what it learned, the next begins further along, and the accumulated distance is the only reason anything complicated exists. Left untransmitted, every generation repeats the same discoveries and never gets past them.

Ask what you know that someone younger is currently working out the hard way. Say it. Small transmissions like this are what the whole arrangement is made of.