"#Pepys could only add and subtract right up to the time of his appointment to the Admiralty, but then quickly learned to multiply and divide to spare himself embarrassment. … You can learn what you need, even the technical stuff, at the moment you need it or shortly before."
—John Taylor #Gatto, *Underground history of American education* (https://archive.org/stream/TheUndergroundHistoryOfAmericanEducation_758/TheUndergroundHistoryOfAmericanEducation_djvu.txt)

Read this fifteen or more years ago, see its truth every day.