You there! Yes you, the guy reading this post.

You literally outswam a million of your father's sperm to be here. Your father did likewise and his father before him. You belong to an ancient lineage going back billions of years. You are literally a cream of the crop super-organism resulting from a selection process that selects only the top (1 in 1 million) to the 1 millionth power.

Yet despite all this, for the first time in a dynasty lasting over a hundred million generations, evolution has somehow produced you, an organism that cannot breed. Now you have to ask yourself, is that just an astronomical coincidence or is there something wrong with your mother's egg?