A human being should be able to

 change a diaper,

plan an invasion,

butcher a hog,

design a building,

write a sonnet,

balance accounts,

build a wall,

set a bone,

comfort the dying,

take orders,

give orders,

cooperate,

act alone,

pitch manure,

solve equations,

 analyze a new problem,

program a computer,

cook a tasty meal,

fight efficienty,

 die gallantly.

SPECIALIZATION IS FOR INSECTS!

-Robert A. Heinlein