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There's also the preparation time. Rice, contrary to popular belief, doesn't come ready to eat off the plant. No, you have to parch the grain for several days on a field (once again it has to be tree-free for the sun to pass). Then rub the hull from the grain, then process it. The whole process is surprisingly lengthy, whereas the method discovered to extract glucose from wood take only an hour.
each time I hold a log, I can't help but feel that instead of firewood it could perhaps be used to solve hunger.