" Then you can go home to the puppeteer worlds and tell them that mucking with human breeding habits is a chancy business. Tell them that enough Teela Browns could make a hash of all the laws of probability. Even basic physics is nothing more than probability at the atomic level. Tell them the universe is too complicated a toy for a sensibly cautious being to play with. "

― Larry Niven , Ringworld (Ringworld, #1)