7 -- One second used to be defined as 1/86,400 the length of a day. However, Earth’s rotation isn’t perfectly reliable. Tidal friction from the sun and moon slows our planet and increases the length of a day by 3 milliseconds per century.
8 -- This means that in the time of the dinosaurs, the day was just 23 hours long.
Colombia Strikes the Latest Blow to the Latin American Left
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Front-runner Abelardo de la Espriella is no classical liberal, but his
victory in Colombia would mark a decisive rejection of the left-wing
project that ha...
11 hours ago
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