Autores:
  • Invention breeds invention. No sooner is the electric telegraph devised than gutta-percha, the very material it requires, is found. The aeronaut is provided with gun-cotton, the very fuel he wants for his balloon.

    Ralph Waldo Emerson (2013). “Delphi Complete Works of Ralph Waldo Emerson (Illustrated)”, p.2461, Delphi Classics