A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, programme a computer, cook a tasty meal, fight efficiently, die gallantly.
Specialization is for insects.
For Love Ranganathan's Five Library Laws Books are for use. Every reader his or her book. Every book its reader. Save the time of the reader. The library is a growing organism.