The great chain that leads to you

In order for you to be here, every one of your ancestors had to survive long enough to reproduce. It’s true for your parents, your grand-parents, your great-grandparents and back and back, through countless generations to the moment that organisms capable of reproduction first appeared on this planet.

If any one link in this billions-long chain had been broken, the you that is reading this would not be with us. Is that not enough to inspire wonder and gratitude, even in the midst of the most everyday of activities?