Another Heinlein quote, from a reader:

“Anyone who cannot cope with mathematics is not fully human. At best he is a tolerable subhuman who has learned to wear shoes, bathe and not
make messes in the house.” — Robert A. Heinlein, Lazarus Long, “Time Enough for Love.”

Incidentally, Rick Brookhiser, of all people, has a Heinlein anecdote. He told it at an editorial dinner. I’d pass it on to you, but I forget the precise details, and anyway it’s Rick’s anecdote. You there, Rick?