Before Present BP years is a time scale used mainly in archaeology , geology , and other scientific disciplines to specify when events occurred before the origin of practical radiocarbon dating in the s. Because the "present" time changes, standard practice is to use 1 January as the commencement date epoch of the age scale. The BP scale is sometimes used for dates established by means other than radiocarbon dating, such as stratigraphy. Some archaeologists use the lowercase letters bp , bc and ad as terminology for uncalibrated dates for these eras. Radiocarbon dating was first used in Beginning in , metrologists established as the origin year for the BP scale for use with radiocarbon dating, using a based reference sample of oxalic acid.
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College dating is the set of behaviors and phenomena centered on the seeking out and the maintenance of romantic relationships in a university setting. It has unique properties that only occur, or occur most frequently, in a campus setting. Such phenomena as hooking up and lavaliering are widely prominent among university and college students. Hooking up is a worldwide phenomenon that involves two individuals having a sexual encounter without interest in commitment. Lavaliering is a "pre-engagement" engagement that is a tradition in the Greek life of college campuses. Since fraternities and sororities do not occur much outside of the United States, this occurs, for the most part, only in the US.
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