Without introverts, the world would be devoid of:

the theory of gravity
the theory of relativity
W. B. Yeats’s “The Second Coming”
Chopin’s nocturnes
Proust’s In Search of Lost Time
Peter Pan
Orwell’s Nineteen Eighty-Four and Animal Farm
The Cat in the Hat
Charlie Brown
Schindler’s List, E.T., and Close Encounters of the Third Kind
Google
Harry Potter

— Susan Cain, Quiet: The Power of Introverts in a World That Can’t Stop Talking (New York: Crown, 2012), 5.