Remove the dominant (larger, right) claw of a "right - handed" male fiddler crab. Then, it will grow a feeding (smaller) claw, and the left claw will become larger and dominant. A male fiddler crab fights and impresses females with the dominant claw. When a right- handed fiddler crab loses a fight, it becomes a left-handed fighter.
Are men like fiddler crabs, in some way or others? Why is human evolution so stubbornly right-handed?