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But it wasn't until the late 1700s -- when Scottish geologist James Hutton, who observed sediments building up on the landscape, set out to show that rocks were time clocks -- that serious scientific interest in geological age began.Before then, the Bible had provided the only estimate for the age of the world: about 6,000 years, with Genesis as the history book.

See more » THE GENERAL' S DAUGHTER is movie that has been done before.

But it knows this and is able to look past it's cliché's and have fun with the genre.

Army CID detectives and ex-lovers Paul Brenner and Sara Sunhill are called in to investigate, and find themselves wrapped up in a maelstrom of sexual impropriety and misguided face-saving.

(at around 46 mins) After visiting the office of the murdered victim, the two investigators go to the Officer's Club for a drink.

This rate of decay is constant for a given isotope, and the time it takes for one-half of a particular isotope to decay is its radioactive half-life.

For example, about 1.5 percent of a quantity of Uranium 238 will decay to lead every 100 million years.

Segment from A Science Odyssey: "Origins."Geologists have calculated the age of Earth at 4.6 billion years.

But for humans whose life span rarely reaches more than 100 years, how can we be so sure of that ancient date? Even the Greeks and Romans realized that layers of sediment in rock signified old age.

Many chemical elements in rock exist in a number of slightly different forms, known as isotopes.

Certain isotopes are unstable and undergo a process of radioactive decay, slowly and steadily transforming, molecule by molecule, into a different isotope.

The school was founded as a public medical college in 1834, and became a comprehensive university in 1847. a public university, and the law department was added to the university.

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