Fermi Approximation

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Is this funny thing. This says that 1, 10, and 100 are the same thing, and as a what-if (xkcd) once said:

Age: 10
Height : 10 feet
Number of Arms: 1
Number of Legs: 1
Total number of limbs: 10 (This is because you round to the nearest power of ten by taking root 10 which is ~3.1 and 4 > 3.1)
Average Driving Speed: 100 mph

Also Fermi tells me that I weigh 100 pounds, drink 100 oz of water each day, that I am 100 inches tall and 100 cm tall, and therefore 10 ft = 100 inches = 100cm. Yes, that seems about right. Also, Airplanes travel at 1000 mph, and the fastest bullet train also travels at 1000 mph. The speed of sound is also 1000 mph. Therefore, airplanes cannot fly because sound would brake the airplane up. Yes, that sounds about right too.

Moral lesson here: Fermi approximations might be good for something like the size of the observable universe, but are definitely NOT good for the modern world (which, by the way, has a diameter of about 100,000 km (and miles).) 

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