Who Were Your Millionth-Great-Grandparents?
Our pre-human ancestors are back there somewhere in the deep time that makes up Earth's braided history of life and change — and we are the tip of the spear moving that life forward, says Adam Frank.
Human civilization began about 10,000 years ago with dawn of agriculture (give or take a millennia or so). This seems like such a long time that it can be hard to reconcile with the short span of our lives.
But there is another way to look at it
