Well, I have a friend who is retired military police and he did security in Area 51......he says, yes, there are aliens and yes, there was a ship and we are no closer to being able to figure out what kind of metal it is. Can't do a thing to it....won't scratch, melt, dent, register on a spectrometer, etc. He says they look like elongated humans....claims he saw them with his own eyes.....bottom line, most of us don't know for sure and never will.