I can think of a dozen experiments I would like to attempt, to learn more about them. But until someone or some group comes forward to do such a study, I am perfectly willing to leave them alone and just enjoy the element of mystery that they introduce into my world. I also enjoy having them a part of my collage of natural mysteries about the world. I do not feel compelled by any physical evidence I have seen to conclude that some of these are alien spacecraft. I agree with Carl Sagan.
Extraordinary claims require extraordinary evidence.
A million anecdotes do not add up to the same weight as 10 grams of alien metal, and every psychologist and lawyer will tell you that humans are about the worst 'eye witnesses' you could possible want to prove a case one way or the other. Dr. Sten Odenwald Return to Ask the Astronomer .