The discussion wasn't over Tom. I assume you closed it because the rudeness and ingnorance on fundamentals I've experienced with you before. I challege you Tom to debate this if you really think it's nonsense that speed doesn't have direction. I'll beat you every step of the way, because I have respect for the roots in which physics grew out of. You seem not to understand the fundamentals. By my experience of your non-intelligent but yet rude reations to people on this site, you seem to be more of a mocking bird of suggested teachings than one who understands the principles that the teachings are based upon. If you really think you can debate me and win, open the thread and bring it on. If not, then don't call yourself a mentor, because mentors lead in the right direction. They don't shut doors. Give up. And behave rudely to people. That is for the weak minded teachers I've met in my life. And you act just like one! If you think you're so smart and call yourself a mentor physicist, then beat me in argument on this topic. I know you can't, and I'll prove it, given the opportunity that any leader would take to show how to debate and lead in the correct direction.