Quickening Pace of Evolution

Two billion years ago, our ancestors were microbes, a half-billion years ago, fish; a hundred million years ago, something like mice; ten million years ago, arboreal apes; and a million years ago, proto-humans puzzling out the taming of fire. Our evolutionary lineage is marked by mastery of change. In our time, the pace is quickening.

~ Carl Sagan (1934-11-09 1996-12-20 age:62)