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A comment on Ask HN: Do you know any useful "Back of the Envelope Calculations"?.

Re:Ask HN: Do you know any useful "Back of the Envelope Calc... by nailer on Saturday September 18, 2010 @04:51AM (#1703942)
Two:

* Golden ratio is also miles to ks. Which means you can use Fibonacci to convert miles to ks.

* Divide by square route of two for compound doubling time.

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Re:Ask HN: Do you know any useful "Back of the Envelope Calc... by zalew on Saturday September 18, 2010 @09:28AM (#1704150)
kilometer is km not ks. just sayin'
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Re:Ask HN: Do you know any useful "Back of the Envelope Calc... by nailer on Saturday September 18, 2010 @11:11AM (#1704299)
One is an abbreviation. The other is a coloquial term, pronounced 'kays' used in most western speaking metric countries.
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