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我猜是因著2008年即將放映《Frequently Asked Questions About Time Travel》這部電影，促使老師問了這問題。這電影類似80年代《回到未來》(Back to The Future)那部科幻片，都是穿梭在時光隧道中，鬧出無數有悖常理的事件。我還沒看過這電影，不能“黑白講”。但阿丹寫的，讓我思索：究竟人類可不可能超越三度空間內的時空限制？若能掙脫，進入了四度空間，會發生什麼景況？時光旅行、或時光隧道，種種目前想不通的情形，應該都可以因著第四度空間的存在而解決。還不錯，阿丹的腦袋瓜開始有了邏輯推理概念，既能推翻不合常理的假設，又能為可能存在的四度空間，預留了退路。／瀟碧
Who here votes time travel is possible? Well, I say no! Imagine somewhere in the future; a guy named Bob has a time suit. For some weird reason, Bob goes back in time to kill himself. But wait, if his present self kills his past self, Bob wouldn’t be alive to travel back in time to kill himself. Then that means he didn’t kill his past self in the first place so he continues living which means he could still go back & kill his past self. AHA! One of two things will happen; all existence & time will freeze because reality and logic cannot find a way around that flaw. Or everything will just pop & disappear. Time travel is impossible; of course God can allow it to happen. And all of mankind will be destroyed because of all the time paradoxes and reality bending stuff.(by Josh 11. 30. 07)