But human nature was also shaped as groups competed with other groups.

Good selfishness takes everybody along with one’s own

Major transitions may be rare, but when they happen, the Earth often changes.41 Just look at what happened more than 100 million years ago when some wasps developed the trick of dividing labor between a queen (who lays all the eggs) and several kinds of workers who maintain the nest and bring back food to share. This trick was discovered by the ear

There it is: the ultimate commandment. Take care of your own. Protect your genes. Lay down your life for one child, two siblings, or eight first cousins. How many friends would that translate to? How many strangers who might still be out there, laying down their lives for other species?