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The decay of argon 40 to argon 39, for instance, played a vital role in underscoring the significance of two ancient human skulls unearthed in the Republic of Georgia last summer. Swisher III of the Berkeley Geochronology Center and his colleagues reported, are more than 1.7 million years old, and as such represent the first humans to leave Africa to colonize the rest of the world.Argon dating can also be used to date materials as young as 10,000 years and as old as billions of years.Each isotope has what is known as a half-lifethat is, a period of time in which half of the atoms in a population decay into stable daughter elements.

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Still others, like amino acid racemization, show promise but have not yet taken wing.

Now, nearly 100 years after Boltwood's groundbreaking work, it is estimated that Earth formed at least twice as long ago as he had claimed.

Carbon 14 can thus reliably date items only up to around 40,000 years old.

Other radioactive isotopes can be used to accurately date objects far older.

More recently, they have developed a number of new methods.

Some use radioactive isotopes; others take advantage of different phenomena, such as thermoluminescence and electron spin resonance.Game Show by Chuck Barris Productions which debuted on ABC in 1965 with host Jim Lange.It was the first game show to enter Reality TV territory, in that the winning couple actually went on a date after the show.Syndicated revivals were moderated by Elaine Joyce, Jeff Mac Gregor, Brad Sherwood, and Chuck Woolery. It's only the hot new romantic television property created by Rachel and Griffin, two of Hollywood's most in-demand pitchmasters. Geologists, paleontologists and archaeologists have pieced together a fairly detailed account of how Earth and its inhabitants evolved.

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