Carbon dating on live things
Willard Libby from the University of Chicago put it to the test.By 1949, he had published a paper in Science showing that he had accurately dated samples with known ages, using radiocarbon dating.Fifty, 20, or 100 years is a lot of time, wherein a lot can happen.Fifty years is the difference between Alexander Graham Bell's telephone and television.In other words, life in the universe moves inconceivably slowly.
It took just short of 10 years for the Ancient Greeks to build the Parthenon on the Acropolis of Athens. Charles Darwin spent just five weeks in the Galapagos, a voyage without which he would have never written On the Origin of Species.A decade after Douglass's big discovery, two Berkeley scientists took the first step towards an alternative way to date floating chronologies and indeed any other "once-living" thing. Also known as radiocarbon, carbon-14 is a radioactive isotope of carbon with an atomic nucleus of six protons and eight neutrons. They discovered its half-life, or the time it takes for its radioactivity to fall by half once the living thing dies, is 5,730 years (give or take 40).It's unusually long and consistent half-life made it great for dating.The first single-celled organisms on Earth did not appear until about a billion years later.Dinosaurs did not appear until 230 million years ago, and ruled the planet for 135 million years.
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In its most conventional form, dendrochronology works like this. They have no bias, and they have no political agenda; they just stand at locations all over the world," says Charlotte Pearson, an assistant professor of dendrochronology at the UA, studies samples under a microscope.