Time since the first iron steamship crossed the English Channel

Time since the first iron steamship crossed the English Channel (202 y)

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If Time since the first iron steamship crossed the English Channel (202 y) was a standard unit ...

Time since first humans in Australia (50,000 y)...more would be 250 x Time since the first iron steamship crossed the English Channel
Age of oldest wooden wheel (5,150 y)...more would be 25 x Time since the first iron steamship crossed the English Channel
Time since building of Stonehenge (5,120 y)...more would be 25 x Time since the first iron steamship crossed the English Channel
Time since the earliest writing (5,100 y)...more would be 25 x Time since the first iron steamship crossed the English Channel
Time since earliest wheeled vehicles (4,000 y)...more would be 20 x Time since the first iron steamship crossed the English Channel
Time since the birth of Hero of Alexandria (2,014 y)...more would be 10 x Time since the first iron steamship crossed the English Channel
Time since start of building of Great Zimbabwe (1,000 y)...more would be 5 x Time since the first iron steamship crossed the English Channel
Time since the death of Shakespeare (406 y)...more would be 2 x Time since the first iron steamship crossed the English Channel
Time since the birth of mathematician Maria Gaetana Agnesi (206 y)...more would be about as big as Time since the first iron steamship crossed the English Channel
Time since the first passenger steam railway service (199 y)...more would be about as big as Time since the first iron steamship crossed the English Channel
Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)...more would be 2/5 of Time since the first iron steamship crossed the English Channel
Lifespan of human being (80 y)...more would be 2/5 of Time since the first iron steamship crossed the English Channel
Time since first Apple Macintosh Computer launched (40 y)...more would be 1/5 of Time since the first iron steamship crossed the English Channel
Time since first Tesla Model S launched (10 y)...more would be 1/20 of Time since the first iron steamship crossed the English Channel
Lifespan of rat (2 y)...more would be 1/100 of Time since the first iron steamship crossed the English Channel
Period of Earth's orbit (1 y)...more would be 1/200 of Time since the first iron steamship crossed the English Channel