Thank's Bob
I'm going to kick that thought around for the day before I read up on it!
1st comes to mind tho is the neighbors, as we all know sound in space travels far, or does it? hmm perplexed already dam
2nd is the caterpillar drive, learned that one thru Hollywood;) tho it works well say in tunneling.
Thoughts are beginning to build as I write: Sound within our gravity will move things that are on the verge of moving; say like snow. or boys and girls, which usually leads to more, boys and girls!? Starting to write like Carl, hmm chit