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"We, including scientists, have considered ourselves as sort of the pinnacle of evolution," noted lead researcher Bruce Lahn, a University of Chicago geneticist whose studies appear in Friday's edition of the journal Science.

"There's a sense we as humans have kind of peaked," agreed Greg Wray, director of Duke University's Center for Evolutionary Genomics.

"The genetic evolution of humans in the very recent past might in some ways be linked to the cultural evolution," he said.

Other scientists urge great caution in interpreting the research.

To make matters worse, the birth date given for Christ is usually between 7 and 2 BC. In order to accommodate political correctness, the CE (“Common Era”) and BCE (“Before Common Era“) terminology was also promulgated, as early as the 17th Century in Europe.

Just to keep you on your toes, the “C” in CE and BCE can also stand for “Current.” At least this is all better than another old form of identifying years, referring to our Current Era as the “Vulgar Era.”Obviously, ancient people and non-Europeans used a variety of other systems to designate what year it was and to keep track of years, and often used a system of what year in a given monarch’s reign it happened to be.

In order to deal with the fact that the “present” changes every day and every year, January 1 of 1950 was chosen to be used by scientists for a common understanding of old objects being dated.

Using DNA samples from ethnically diverse populations, they identified a collection of variations in each gene that occurred with unusually high frequency.

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.