2 Luminous balls fall in Kazakhstan sp?
http://www.mosnews.com/weird/2009/05/14/ufos/
Chisel won’t penetrate after they cool.
Now THIS is the kinda of UFO evidence I like. Something physical. From the description, it sounds like it might be something obviously important, if it was encased in a hard metal. One idea is that it might be a thermal electric generator from some kind of satellite that had re-entered earths atmosphere. These things contain some radioactive material. Those guys would be well advised to put those chisels away.