What's Really Behind 'Haunted' Houses
Heard a ghost in your house? If so, you might want to check your pipes. A new study claims that paranormal activity can be explained by infrasound vibrations in old pipes. Infrasound is a very low-frequency sound that can occur in old buildings. Although people can't usually hear it, even short exposure can alter mood and increase cortisol levels, according to researchers from MacEwan University in Edmonton, Alberta, writes the Daily Mail.
