Kilometers count
Kilometers count
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Apparently you can use the Fibonacci sequence to estimate the conversation pretty accurately.
Eg: 3mi is 5km, 5mi is 8km, 8mi is 13km, etc.
The Fibonacci sequence tends to grow at the Golden ratio (approx 1.618) while the actual conversion is ~1.609 so it does usually work well.
In fact any Fibonacci-like sequence with different starting numbers eventually will work, after it gets past the initial crop of bad conversations, as such sequences have growth rates than tend toward the golden ratio as they grow long enough.
For example starting from 2, 9 instead of 1, 1:
2, 9, 11, 20, 31, 51, 82
20 mi ~= 32 km 31 mi ~= 50 km 51 mi ~= 82 km
I was watching the movie 3 Iron. The guy steps on a scale and it says he is 65 kg. I start yelling at the movie because that guy is clearly 85 kg. He gets off the scale, takes it apart, puts it back together and gets back on it. 85 kg.
That was the moment I read I had completely mastered metric weights.