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.
But if he fixates at a particular stage, the method of obtaining satisfaction which characterized the stage will dominate and affect his adult personality."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.Despite his spontaneous decision to propose, Sheldon had already bought a ring, having already thought about making a life-long commitment to his love. Viewers quickly took to Twitter to react, with some left in tears after Sheldon finally popped the question.At the end of the grand finale, Amy is stunned to open the door in her dressing gown to find Sheldon on one knee, while holding out a ring. One fan wrote 'OK, when Sheldon & Amy kissed for the first time I cried.