In humans the vocal tract acts as a filter on the sound from the source, and the "source-filter theory" held that the separate, fine control of the vocal tract to be the product of a long evolution in the development of the subtleties of speech.

BBC: Helium-huffing gibbons 'sing with soprano technique'

Case studies, historic maps, photographs, newspapers, government documents, and original objects are used to explore the evolution and development of the once rural island through the centuries, beginning with its early Dutch days.

FORBES: History Buff Alert! Staten Island And Dutch New York

So how does this thinking apply to the continual evolution of the talent that drives that development.

FORBES: Applying Lean Startup Thinking To Managing Talent