About 30,000 years ago, a tiny mutation arose in a gene known as EDAR and began to spread rapidly in central China, eventually becoming common in the region.from Tiny mutation may have shaped modern humans, scientists say
Living beings evolve through a process known as selection. Organisms with advantageous traits thrive, passing their DNA to another generation. Harmful traits die off when their hosts can't live long enough to reproduce.
So Adam Lanza was actually a heroic figure who was willing to face the ultimate pointlessness of existence, and to rescue a couple of dozen people from it. Too bad he didn't control our nuclear arsenal - he could have saved us all.
By the way, what genetic variation gave rise to DNA, and how old IS the universe, actually? Several quadrillion years?