[Libby] "I suppose he was."

"He was, all right. I had quite a set-to with him at the Meeting in 2012. He had a powerful vocabulary." Lazarus frowned slightly. "Funny thing, Andy... I recall that vividly, I've always had a good memory-yet it seems to be getting harder for me to keep things straight. Especially this last century."

"Inescapable mathematical necessity," said Libby.

"Huh? Why?"

"Life experience is linearly additive, but the correlation of memory impressions is an unlimited expansion. If mankind lived as long as a thousand years, it would be necessary to invent some totally different method of memory association in order to be eclectively time-binding. A man would otherwise flounder helplessly in the wealth of his own knowledge, unable to evaluate. Insanity, or feeble-mindedness."

"That so?" Lazarus suddenly looked worried. "Then we'd better get busy on it."

"Oh, it's quite possible of solution."