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Article Title:	A Diamond Date
Author of reported comment:	A fellow Christian
Comment Date:	21:32 on Jul 21 2009
Comment:	Although the half-life of carbon-14 makes it unreliable for dating fossils over about 50,000 years old, there are other isotopes we use to date older artifacts. These isotopes have longer half-lives and so are found in greater abundance in older fossils. Some of these other isotopes include: * Potassium-40 found in your body at all times; half-life = 1.3 billion years * Uranium-235; half-life = 704 million years * Uranium-238; half-life = 4.5 billion years * Thorium-232; half-life = 14 billion years * Rubidium-87; half-life = 49 billion years

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