20 hertz to 20 kilohertz: the range of frequencies humans are able to hear. Sound is a natural constant, as essential and expected as the light we see and
We've all heard at least one ghost story in our lifetime. It seems that everyone and every place has come in contact with the paranormal. Statistically,
The Author of Chasing Ghosts Takes Us on a Tour of the Spirit World gizmodo.com.au - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from gizmodo.com.au Daily Mail and Mail on Sunday newspapers.