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Science Leap second? Why June 30 will be one second longer (+video)

A rare 'leap second' will make the day slightly longer.

Elise Amendola/AP

Tuesday may feel a little longer than usual, thanks to an extra "leap second." Instead of changing from 23:59:59 on June 30 to 00:00:00 on July 1, the last minute of June will be 61 seconds long.

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