Learning is slow and hard without a teacher. Yes, every piece of information you need is in a book or online somewhere, but a mentor shows, demonstrates, evaluates, rewards, and provides context and attitude. The Grand Encyclopedia – the continuity of human capability – is not what is written but what is handed down from person to person, in person. It is an unbroken line of know-how from the Achueulean hand axe to your machine. This is the memetic transmission of culture and how we avoid having to re-invent everything from first principles each generation. Novice mechanics usually intuit that they need guidance; it is the experienced mechanic who forgets that they, too, need a mentor. Don’t be arrogant. Unless you are some kind of Boddhisattva, everyone needs mentorship, and everyone has some mentorship to offer. Be humble in teaching as well as learning.