Naked Archaeologist Diana O Carroll takes us on a trip of dating ancient artefacts. Plus we ask, is city living an immune booster?
Neil and Babette McDonald wrote in with this: Historians and archaeologists talk about ancient artifacts and structures which are so many thousands of years old. How do they date these objects? Is it just from carbon dating? And did these ancient civilisations have some sort of time and date recording system in place as well?
Links to a number of ancient (and some not-so-ancient) calendars are available here: http://en.wikipedia.org/wiki/List_of_calendars#Obsolete_calendars
Inorganic dating: Crystal grains in pottery, lava and sediments accumulate crystal defects due to radioactivity in the material, and also from cosmic rays. This "clock" is reset when pottery is "fired", or dirt is exposed to sunlight. This energy can be released as photons by heating the sample or irradiating it with light.
Carbon dating. confusious says, Wed, 15th May 2013
Online dating. dlorde, Fri, 17th May 2013
dlorde - lovely +1