Wikiquote says this is an unsourced variant of "[I do not] carry such information in my mind since it is readily available in books" (referring to the speed of

Wikiquote says this is an unsourced variant of "[I do not] carry such information in my mind since it is readily available in books" (referring to the speed of sound) https://en.wikiquote.org/wiki/Albert_Einstein https://en.wikiquote.org/wiki/Albert_Einstein