unexplained events includes many strange instances of stones falling from the sky - or somewhere. Showers of stones, often from clear skies and in areas where rockslides from mountains cannot be blamed. Hails of stones pummeling rooftops and people, often causing damage and injury. Investigations of these events usually end with unnerved victims and with officials scratching their heads in puzzlement or, out of desperation, inventing "explanations" that are sometimes as outlandish as the events themselves.
Click the link below to read the article by Stephen Wagner:
http://paranormal.about.com/cs/earthmysteries/a/aa042604.htm