Long ago, before Gutenberg, if you wanted to know something, you had to memorize it.
"Can you imagine Fred not re-reading Twelve Angry Men and trying to memorize the dialog?" he kidded.
The man who tore people in two had been beyond gentle with her, savoring every inch of her body, as if he was trying to memorize everything about her.
This man's look was considering, as if he were trying to memorize her features in case he needed the information in the future.
You will be able to work more efficiently if you just memorize the formulae and don't have to keep looking them up.