Until all the water higher up is now downhill, and the water wheel stops
turning. Ah, but the water from uphill is replenished by rain, you say,
and that is true, so when there is no more water suspended in the air,
the rain will stop, and then so will the water wheel. Ah, but the water
suspended in the air comes from the evaporation of the water from
downhill, and that is true, so when the evaporation stops, then there
will be no more water suspended in the air, there will no longer be
rain, and there will be no water from uphill, and the water wheel will
stop turning. Ah, but the evaporation of the water comes from the power
radiated by the sun, you say, and that is true, so when the sun stops
being a power source, then there will be no more evaporation, no more
water suspended in the air, no more rain, no more water running
downhill, and the water wheel will stop.
So you see, John, the water wheel is solar-powered.
--
Odd Bodkin -- maker of fine toys, tools, tables