The initials BP or bp and rarely B. While BP is also used generally as an imprecise estimate of an age of an object or event, the use of it in science was made necessary by the quirks of the radiocarbon methodology. Radiocarbon dating was invented in the late 's, and within a few decades, it was discovered that while the dates retrieved from the method have a sound, repeatable progression, they are not a one-to-one match with calendar years. Most importantly, researchers discovered that radiocarbon dates are affected by the amount of carbon in the atmosphere, which has fluctuated greatly in the past for both natural and human-caused reasons such as the invention of iron smelting , the Industrial Revolution , and the invention of the combustion engine. Tree rings , which keep a record of the amount of carbon in the atmosphere when they are created, are used to calibrate or fine-tune radiocarbon dates to their calendar dates. Scholars use the science of dendrochronology, which matches those annular rings to known carbon fluctuations.
BP: How Do Archaeologists Count Backward Into the Past?
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Archaeologists had once thought construction of megalithic monuments was far beyond the capabilities of hunter-gatherers. They believed that people had to invent farming prior to settling in communities. Only with sufficient food resources could people settle down and develop the social hierarchy required to construct megalithic architecture. They believe that combined with alleged evidence of an older Sphinx and other monuments around the world, orthodox archaeologists will finally be forced to concede they have been misled about the antiquity of humanity. That alone makes it one of the most important archaeological sites ever discovered. It was first described by Peter Benedict as part of a joint project between the Universities of Istanbul and Chicago — Evidence indicates the site was used for thousands of years.
10 Fascinating Facts About the Evolution of Dating and Courtship
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The rituals of courtship have evolved over time, and what is considered romantic today would have been scandalous, if not criminal, less than years ago. As revealed in Moira Weigel's Labor of Love: The Invention of Dating , a remarkable history of the subject, here are 10 things you might not know about dating and courtship over the years. It was first used in a newspaper column in which a young man laments that his girlfriend is seeing other people—that they are "fillin' all my dates," as in "the dates on her calendar.