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Benjamin Franklin tied a key to a kite string during a thunderstorm and he proved that lightening and static electricity are the same.
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It was a military tractor that ran off steam. It could go 2.5 miles per hour.
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Coal has become the main principal fuel for the steam-powered trains and as the railroads branched into the coal fields, they became a vital link between markets and mines.
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The first gasoline-powered automibile was built by Karl Friedrich Benz and it was a three wheeler.
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It didn't last too long because the company went out of business after the first three months.
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These utilities were engaged in interstate commerce.
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