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To determine the ages of these specimens, scientists need an isotope with a very long half-life.Some of the isotopes used for this purpose are uranium-238, uranium-235 and potassium-40, each of which has a half-life of more than a million years.Unfortunately, these elements don't exist in dinosaur fossils themselves.Each of them typically exists in igneous rock, or rock made from cooled magma.
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While the oldest known rocks on Earth are about 3.5 billion years old, researchers have found zircon crystals that are 4.3 billion years old [source: USGS].This is what archaeologists use to determine the age of human-made artifacts. The half-life of carbon-14 is only 5,730 years, so carbon-14 dating is only effective on samples that are less than 50,000 years old.
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One diagnostic sign that I have always found very useful in diagnosing Autism Early is how the child reacts to his name being called out. If out of ten, the child is responding less than 7 -8 times when a stranger calls out his name, there is a strong chance that the child could be falling in the Autism Spectrum. If you can leave the medical diagnosis aside, Take a brief pause and understand what has happened to your Child ( it will help you in his recovery ). This is stopping him from learning new things Autism Confirmed -Time to go all guns blazing Its now or never, you cant afford delay in this matter.… continue reading »