Looking on line today, I see that because of variations in the earth's rotation around the sun, scientists are adding a leap second to the atomic clock on June 30th. At 8pm Eastern time, the most accurate clock in the world will be 61 seconds long and not 60. This will keep the atomic clock in synch with mean solar time. Such leap seconds happen periodically. But will anyone notice? Scientists say that over the course of one's lifetime, 60 leap seconds might be added. So if no changes were made to our atomic clock, that would mean the sun would get up one minute later at death than it did a birth. It seems like such a minuscule thing. But in a day and age where all computers are networked, it is important that time is kept as accurately as possible. And so tomorrow a leap second will be added.