Some "Ghosts" May Be Sound Waves Just Below Human Hearing

There are many possible explanations for hauntings, not least that humans are highly suggestible creatures, especially when we want to believe. But some ghost sightings might actually be the result of sounds — sound waves that vibrate just below our range of hearing, dubbed the “fear frequency.” »10/27/15 1:00pm10/27/15 1:00pm