Chiroptera asked to have this OP (opening post) promoted.
I've done so even though it is a bit thin to deserve to be promotoed.
I'd like to ask that Chirotera answer and others watch out for a pile-on. If you think Chiro is missing an important point or way to explain something then don't worry about contributing. But don't overwhelm the newbie. ok?
added by edit
City on the Hill:
Welcome to EvC. This site offers you a great chance to learn. But you'll have to be prepared to listen to those who want to help you learn. Your understanding of the nature of science (and, I suspect, many of the facts studied) is very weak. If you accept that you have a chance to learn. If you arrogantly think you already know it all then you will lose a great opportunity.
Edited by AdminNosy, : Added a bit for CotH