Sound is a movement which is handed on from atom to atom in a gas through which the sound is passing, just… — William Henry Bragg Copy Share Image
“The sound of someone passing by the library entrance made the two of them scatter away, like cockroaches from the light.” — A.Z. Green Copy Share Image
Watson, ... if I can get a mechanism which will make a current of electricity vary in its intensity, as the air… — Alexander Graham Bell Copy Share Image
