Energy is abstract.  It powers lights, appliances, cars.  And even though we pay an electric bill, utilities bill and cash to the gas station, energy remains abstract.

That is, until we think about having to hand-crank a generator.

Thinking about energy like this is valuable.  No, lights aren’t powered by a guy cranking a generator anymore.  But the energy required to power the lights is the same or more.

Why not turn off some lights, especially in corporate office buildings.  So many of them stay on all night.

C’mon.  Let’s give the guy hand-cranking the generator a break.