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This stored radiation dose can be evicted with stimulation and released as luminescence. Lepper, North Dakota State University The age equation is expressed as a simple ratio: Age (ka) = D is the average dose rate over time.

The calculated age is the time since the last exposure to sunlight or intense heat. Equivalent dose is the amount of radiation dose that is necessary to account for the measured luminescence signal, in other words, how much radiation is needed to get from zero luminescence to the current, natural luminescence. Luminescence dating has been applied (depending on conditions) from sediments ranging from 10 – 10, although more commonly the upper limit is 100-400ka.

"The Internet holds great promise for helping adults form healthy and supportive romantic partnerships, and those relationships are one of the best predictors of emotional and physical health," says Reis. Comparing dozens and sometimes hundreds of possible dates may encourage a "shopping" mentality in which people become judgmental and picky, focusing exclusively on a narrow set of criteria like attractiveness or interests.

And corresponding by computer for weeks or months before meeting face-to-face has been shown to create unrealistic expectations, he says.

Online dating fundamentally changes access to information.

"In the words of one online dater: 'Where else can you go in a matter of 20 minutes [and] look at 200 women who are single and want to go on dates?

' " Along with Reis, other co-authors include Eli Finkel, associate professor of social psychology at Northwestern University and lead author on the paper; Paul Eastwick, assistant professor of psychology at Texas A&M University; Benjamin Karney, professor of psychology at the University of California at Los Angeles; and Susan Sprecher, professor of sociology and psychology at Illinois State University.

Online dating is a multi-million-dollar growth industry.

According to research by Michael Rosenfeld from Stanford University and Reuben Thomas from City College of New York, in the early 1990s, less than 1 percent of the population met partners through printed personal advertisements or other commercial intermediaries.

By 2005, among single adults Americans who were Internet users and currently seeking a romantic partner, 37 percent had dated online.

"People with strong beliefs in romantic destiny (sometimes called soulmate beliefs) -- that a relationship between two people either is or is not 'meant to be' -- are especially likely to exit a romantic relationship when problems arise …

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