What do you say when a 3rd grader asks you what the 4th Dimension is? Why are these nebulous questions always asked before going to bed?
"Just relax and don't worry over things that needn't trouble you," Mrs. Whatsit said. "We made a nice, tidy little time tesser, and unless something goes terribly wrong we'll have you back about five minutes before you left, so there'll be time to spare and nobody'll ever need to know you were gone at all, though of course you'll be telling your mother, dear lamb that she is. And if something goes terribly wrong it won't matter whether we ever get back at all." - Madeleine L'Engle, A Winkle in Time.
Dad made me watch this movie. After the scene you hopefully just watched, the guy travels faster and longer. The only point of reference of time is the changing fashions in the women's apparel shop. When he finally figures out how to get from the 1960's to Fall 2010 he will see this!