February used to be the last month of the year.
We may know January and February as the first two months of the year, but these months were actually the last couple of months added to the Gregorian calendar. Before, the Roman calendar only recognized 10 months. However, the winter period was measured in these two months – making February the last month of the calendar. This is also why February has the shortest number of days in a month.

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Shoe shops used X-Ray machines to measure shoe sizes.
Way before radiation was fully understood, shoe shops measured sizes through X-rays in the 1940s.