Article describing how and why "an extra second will be added to 2005 to make up for the slowing down of the Earth's rotation. ... The once-common 'leap second' is the first in seven years and reflects the unpredictable nature of the planet's behavior." Includes a list of previous leap seconds added back to 1972 and links to related information. From LiveScience.com, an online magazine "focusing on innovative and intriguing science and technology."