Energy has seldom been found where we need it when we want it. Ancient nomads, wishing to ward off the evening chill and enjoy a meal around a campfire, had to collect wood and then spend time and effort coaxing the heat of friction out from between sticks to kindle a flame. With more settled people, animals were harnessed to capstans or caged in treadmills to turn grist into meal.

their insatisfaction herein begat that remarkable invention in the funeral pyres of some princes

She tried the same cast several times. I signaled her to switch flies. After two such changes we still couldn't move the fish. Some steelhead are biters; some are not.

The first horse we saw was a proppy old grey being walked about, and agreed that there was one, at least, which would not win.