For those who didn't know

[PrttyBrd]

Apparently human children can release a certain frequency that travels through the adult spine slamming into the brain with such force that it negates all sense of sympathy for the child emitting such a horrid screech.Sympathy and nurturing resume at normal levels once the sirens have been neutralized.By the way: This is also the birth place of gray hair and a very strong wrinkle antagonist.