: Thed, I hate to say this, but unfortunately you are an idiot. Go down and read my posts starting with the subject "A nitpick'" and especially, the one titled " Most books are wrong on this". I suggest that you refrain from any further posting until you take some basic courses in relativity.

As it seems you have decided to pick on me for some reason and use ad hominen attacks any further attempts at my posting in this forum is wasted.

As you think I know nothing I would suggest you go over to http://www.madsci.org where I have been answering students questions on Physics for some years and have only earned the respect of the people who run that site.

I at least have a proven track record in teaching physics. I also have the good manners to leave an E-mail address where I can be contacted if people think I am wrong. When I am wrong, I'll admit to it, I make mistakes and do not attack others for doing the same.