Tell your son to stop trying to fill your head with science — for to fill your heart with love is enough!

Note to the mother of Marcus Chown, who had admired the profile of Feynman presented in the BBC TV Horizon program "The Pleasure of Finding Things Out" (1981). Written after Chown asked Feynman to write her a birthday note, hoping it would increase her interest in science.

Photo of note published in No Ordinary Genius: The Illustrated Richard Feynman (1996), by Christopher Sykes, p. 161. | In a "Quantum theory via 40-tonne trucks", The Independent (17 January 2010), and in a audio interview on BBC 4 (September 2010), Chown recalled the note as: "Ignore your son's attempts to teach you physics. Physics is not the most important thing, love is."