Time since the start of the Iron Age

Time since the start of the Iron Age (3,200 y)

/fact/time-since-the-start-of-the-iron-age

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Neat Ratios ...

Time since the start of the Iron Age (3,200 y)

is 1/2 of Age of the earliest city (6,500 y)...more
is 10 x Time since the birth of Euler (316 y)...more
is 20 x Time since the publication of Volume 1 of Marx's Das Kapital (157 y)...more
is 20 x Time since the birth of physicist Marie Curie (157 y)...more
is 25 x Time since birth of M. C. Escher (126 y)...more
is 40 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)...more
is 40 x Lifespan of human being (80 y)...more

If this was a standard unit ...