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But when dealing with wind power, size, or more specifically height, matters. Outwardly, the ability to turn the kinetic energy of wind into electricity would seem to have little to do with the design decisions made by civil engineers during the Eisenhower administration. ItвЂ™s far from perfect, of course, and itвЂ™s only recently that the specifications for the system have started to put a pinch on things that seem totally unrelated to overpass dimensions - namely, the size and efficiency of wind turbines. It was an interesting lesson at the time, and over the years IвЂ™ve continued to be impressed with the foresight and engineering that went into the Interstate system here in the US.

вЂњBecause thatвЂ™s how big nuclear missiles are.вЂќ He then went into an explanation of how the Interstate Highway System in the USA, then still in its infancy, was designed to make sure the armed forces could move around the country, so overpasses needed to allow trucks with big loads to pass.

As we passed under an overpass, my dad said, вЂњDo you know why the overpasses on these roads are so high?вЂќ Six-year-old me certainly didnвЂ™t, but it was clear dad did and had something to say about it, so we just shook our heads and waited for the lesson.

We were probably all in the front seat, and none of us were wearing seatbelts those were simpler times. Many decades ago, a much younger version of me was in the car with my dad and my brother, cruising down the highway on some errand or another.

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