Imperial came out before metric 
actually now I’m not so sure haha, I thought it did??
But your reasoning is perfect, 1 block is 1 metre to me too… seems about right with our heights etc.
More like 1 block ~ 1/31 femtoparsecs to me…
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I won’t even pretend to understand that @lucadeltodecso 
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I started singing that in my head and BAM there it was!
… just to be the Oortian who walked a …
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Haha, you too. Oh boy
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Handy metric conversions:
- 1 million microphones = 1 megaphone
- 1 million bicycles = 2 megacycles
- 2000 mockingbirds = two kilomockingbirds
- 52 = 1 decacards
- 1/2 lavatory = 1 demijohn
- 1 millionth of a fish = 1 microfiche
- 435.6 graham crackers = 1 pound cake
- 10 rations = 1 decoration
- 10 millipede = 1 centipede
- 3 1/3 tridents = 1 decadent
- 10 monologues = 5 dialogues
- 2 monograms = 1 diagram
- 8 nickels = 2 paradigms
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