"And nature does not continue with a nonfunctional organ."
"Nature would most certainly weed out anything that was completely useless. Evolution of a nonfunctional part does not happen."
"Appendix?"
"It had a use once. It is atrophying now. But the brain should be increasing since we're using it more every year. Instead of being forced into increase by demand, the brain is already too big for the work. How did it get that way?"
"You'll never explain it by the law of supply and demand," said Gene. "We might go over a few brains with analyzers."
"And if you get a nonconforming curve, then what?"
"Fifty years of eliminating the sand to get the single grain of gold."
"You mean process of elimination?"
"Didn't I say it?"
"You'd never recognize it," said Andrew. They both laughed.