"For 13 to be unlucky would require there to be some kind of cosmic intelligence that counts things that humans count and that also makes certain things happen on certain dates or in certain places according to whether the number 13 is involved." Douglas Hofstadter

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Duration of Roman Empire

Duration of Roman Empire (503 y)

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Neat Ratios ...

Duration of Roman Empire (503 y)

  • is about as big as Duration of Carthaginian Empire (504 y)...more
  • is about as big as Duration of Egyptian Empire (500 y)...more
  • is 2 x Period of Pluto's orbit (248 y)...more
  • is 20 x One average human generation (25 y)...more
  • is 250 x Lifespan of rat (2 y)...more
  • is 500 x Period of Earth's orbit (1 y)...more

If this was a standard unit ...

Is That A Big Number? - The Book

Yes, there's now a book based on these numbers. Oxford University Press: July 2018.

Click here to learn more about it.

Click here for Podcast: Andrew Elliott interviewed for New Books Network.

http://itabn.tumblr.com/post/138631317782/this-website