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Aside from not knowing what the gene variants actually do, no one knows how precise the model Lahn used to date them is, Collins added.Lahn's own calculations acknowledge that the microcephalin variant could have arisen anywhere from 14,000 to 60,000 years ago, and that the uncertainty about the ASPM variant ranged from 500 to 14,000 years ago.Those criticisms are particularly important, Collins said, because Lahn's testing did find geographic differences in populations harboring the gene variants today.They were less common in sub-Saharan African populations, for example.In fact, the variations were so common they couldn't be accidental mutations but instead were probably due to natural selection, where genetic changes that are favorable to a species quickly gain a foothold and begin to spread, the researchers report.

That the defining feature of humans — our large brains — continued to evolve as recently as 5,800 years ago, and may be doing so today, promises to surprise the average person, if not biologists.

Just ask loved-up Stella Ansell, 69, and her 72-year-old husband Peter.

The newly married couple of 'silver surfers' from West Sussex were both widowed earlier in life, but they found love again with each other on the internet just two years ago.'And then once I did eventually start trying to go to places like dinners or dancing, I got the feeling that other women were - completely unnecessarily - perhaps a little threatened by me as a single woman.'We both walked up to the door of the pub and there was a sign saying it was closed for refurbishment!

Russell Gray and Quentin Atkinson, of the University of Auckland in New Zealand use the rate at which words change to gauge the age of the tree's roots - just as biologists estimate a species' age from the rate of gene mutations.

The differences between words, or DNA sequences, are a measure of how closely languages, or species, are related.

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    La Comisión, que ha adoptado recientemente seis propuestas legislativas para armonizar en toda la Unión las autorizaciones de vehículos y los certificados de seguridad, seguirá insistiendo en la necesidad de que todos los Estados miembros eliminen los retrasos sufridos y aceleren el despliegue del ERTMS en su territorio.