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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.
Lahn offers an analogy: Medieval monks would copy manuscripts and each copy would inevitably contain errors — accidental mutations.
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.
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.
Then there's a little girl in China whose mum didn't pick her up quickly enouigh, and a girl in South Korea who is literally crying over spilled milk.'Pembroke is now publishing global contributions to his site, and has launched a contest to find the funniest reason for a child crying, with the best one winning a digital camera, donated to him by Sony.
As ecstatic as I was at the birth of my daughter, I felt selfish bringing her, and later my son into our screwed-up world' Pembroke - who writes commercials for radio stations and is married to Charity, a physical therapist - initially began his light-hearted hobby by posting images and captions on his personal Facebook page.
Speaking to Mail Online, Pembroke said: 'It's so interesting.
I seemed to become a mother at exactly the moment things went awry.
'Of course, human beings have always been greedy, violent and dishonest.