Paul -
I haven't seen one, and I haven't personally come across any compelling evidence to make me believe or lack belief in them, only hearsay. As a result, although they may or may not exist, I couldn't say.
I haven't seen one, and I haven't personally come across any compelling evidence to make me believe or lack belief in them, only hearsay. As a result, although they may or may not exist, I couldn't say.