before

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 1950s. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date (epoch) of the age scale. The abbreviation "BP" has been interpreted retrospectively as "Before Physics"; that refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, making dating after that time likely to be unreliable.In a convention that is not always observed, many sources restrict the use of BP dates to those produced with radiocarbon dating; the alternative notation RCYBP is explicitly Radio Carbon Years Before Present.

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  1. Mwl.RCT

    Education in Tanganyika before 1961: A History of Colonial Assimilation and Limited Access

    Before 1961, Tanganyika was a territory that was under the control of different colonial powers, including Germany and later Britain. The education system that existed during this time was largely designed to serve the interests of the colonial powers, rather than the local population. The...
  2. K

    Never seen before

  3. Yofav

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  4. NairobiWalker

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  5. Mnazinguakinoma

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  6. Mpinzire

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  7. Getrude Mollel

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  8. Linguistic

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  9. M

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  10. M

    Before you get Married, here are important informations you should know about your Spouse

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  11. Kifaru86

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  12. ANT DRUGS

    Did you know that December 25th was celebrated thousands of years before the birth of Jesus?

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  13. Da Vinci XV

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  14. Sky Eclat

    Lincoln, before and after the Civil War

    Lincoln akiwa Rais wa Marekani mwaka 1861 iliibuka vita ya wenyewe kwa wenywe chanzo kikiwa haki za watumwa.
  15. kajamaa kadogo

    Internet ilikuwepo kabla ya Kristo?

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  16. M

    Dear men here are three 3 Qualities to look for in a woman before proposing a marriage.

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  17. S

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  18. M

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  19. Masokotz

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  20. Behaviourist

    Before vs after

    BeforeAfter

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