Continuing in my recent mini-theme of ghosts, here’s another supernatural item: British researchers are hypothesizing that people’s experiences of ghosts may be due to hearing “infrasound” — very low-frequency noise. Infrasound occurs in the natural world, and the scientists decided to test precisely what effect it has on us. As CNN.com reports:

In the first controlled experiment of infrasound, Lord and Wiseman played four contemporary pieces of live music, including some laced with infrasound, at a London concert hall and asked the audience to describe their reactions to the music.

The audience did not know which pieces included infrasound but 22 percent reported more unusual experiences when it was present in the music.

Their unusual experiences included feeling uneasy or sorrowful, getting chills down the spine or nervous feelings of revulsion or fear.

(Thanks to SciTech Daily for this one!)