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dwe3k

8 karma · joined September 13, 2017

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dwe3k··on Television is 100 years old today
I remember a similar story from my father, of people in the small town he was in crowding standing in the front yard of a neighbor, crowding around a picture window to look in at the first TV in town in the mid-1950's.
dwe3k··on Using Fibonacci numbers to convert from miles to kilometers and vice versa
I find it interesting, but I question how practical it is for regular use.

On a recent trip, I was driving in Canada in a car bought in the United States that did not have the metric values on the speedometer. But all of the posted speed limits were in values of 5 kph. Once you get that (roughly) 100 kph = 62 mph and 10 kph = 6 mph, there are some simple quick divisions or subtractions to convert the speed limit to close enough.

- 50 kph = (100 kph) / 2 = 62 mph / 2 = 31 mph

- 80 kph = 100 kph - 2 * 10 kph = 62 mph - 2 * 6 mph = 50 mph