For all that as a species we like to think that we are in control of the wider universe, like to think that our mastery of physics and mathematics has put us in charge, little underscores the fallacy of that position as neatly as the Gregorian calendar, an apparently flawless invention, one that defines our lives, where everything sits so snugly.... until every four years we have to add an extra day to stop it all going haywire. Unless that is the year is exactly divisible by 100, but not by
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