youtube for the day/James Burke's "Connections episode 1" about Hydro-electric dams

My last post with anything more than pictures was about how the Europeans took awhile to 'get it' with respect to all the translations of ancient Greek mathematical thought from the Arabs.  I'm related that to James Burke's "Connections" here because he talks about the hydro-electric dam and how that puts us more than a few steps beyond just relying on mother nature to suppy all the food needed to survive.  And, if you've read my ideas about the nature and origin of mathematical knowledge, then you see the relations between this episode of James Burke's "Connections" and that post about the Europeans coming out of the dark ages.