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What is called a Leap Second? and how it is calculated?
Mr Wiki has the full answer http://en.wikipedia.org/wiki/Leap_second
Everybody knows that Wiki is Miss Wiki, not Mr. The fact that she has a low tone voice, some facial hair (she shaves it every day so it is not noticeable) and broad shoulders shouldn't make you mistaken her gender. She is offended!
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An event like a Tsunami also changes the rotational speed of the earth. It would be interesting to identify all such events on the graphs.