#4thgrade science lesson about determining viability of #alternativeenergy sources today. It turned into an unexpectedly sophisticated conversation about long term cost/benefit reckoning, environmental impact, and #watersovereignty. “But if we build dams, what if there’s not enough water downstream for other people? People won’t want to share if they’re making money.” #sw kids think about this. Almost made up for my #teacherfails accidental cock-and-balls shaped #math models earlier in the day.