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Lahn and colleagues examined two genes, named microcephalin and ASPM, that are connected to brain size.If those genes don't work, babies are born with severely small brains, called microcephaly.
It is most useful for minerals older than 100,000 years and can reach way back into the geological past.Working out how old archaeological remains are is a vital part of archaeology.Scientific dating has confirmed the long residence of Aboriginal people in Australia.The method also assumes a 'zeroing' event in the life of the material, when it was either last heated or exposed to sunlight. So suggests new research that tracked changes in two genes thought to help regulate brain growth, changes that appeared well after the rise of modern humans 200,000 years ago.
Scientists attempt to date genetic changes by tracing back to such spread, using a statistical model that assumes genes have a certain mutation rate over time.