One question...if you believe that time travel is possible, then why haven't any 'time travellers' from the future visited us yet? Wouldn't it follow that if time travel were possible then futuroids would have time travelled into our century at least? or is there an underlying phenomenon where time travellers are not "visible" to 'past beings'? I don't mean to undermine your opinions whatsoever for I feel strongly about the topic myself...but of course where there's doubt theres uncertainty... look forward to your reply...