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I was at the Pima Air and Space Museum and came across an old photo of a WWII airbase in England. So many bikes! Bicycles were the most efficient and cost effective way for servicemen to get around. As everyone from millennials to retirees return to city centers, which is where most urbanites lived prior to WWII, a strong case can once again be made that bikes are the most efficient and cost effective way to get around. Pretty darn fun too.