it is a small milestone in human history to have produced a machine that can do this." - Andrew Brown in The Darwin Wars. When I was an undergraduate in 1989 I hooked up an Artificial Intelligence "chatbot" called "MGonz" to the Internet, with interesting results.
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After his alleged break-up with the gorgeous Katrina Kaif in January, the ‘Rockstar’ actor has never spoken about it publicly and was often seen dodging the question.
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In one study, 35 children reported by their mothers to be "behaviorally sugar sensitive" were separated into two groups. The clock was initially calibrated by dating objects of known age such as Egyptian mummies and bread from Pompeii; work that won Willard Libby the 1960 Nobel Prize in Chemistry. But even he “realized that there probably would be variation”, says Christopher Bronk Ramsey, a geochronologist at the University of Oxford, UK, who led the latest work, published today in Science. The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate. Organisms capture a certain amount of carbon-14 from the atmosphere when they are alive. Half were told they were given a sugary drink, half were told it was a sugar-free drink. Then the mothers played with the children and were individually interviewed. When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206. Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element. Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter. Each isotope is identified with what is called a ‘mass number’. |
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