Technically there's no such thing as time travel - as far as we know - but there is a surefire way to transport yourself into the past: open up a new sneaker box, fold back the paper, and take a deep whiff. Maybe not too deep, unless you want to travel back to Woodstock or something. But in that one instant, that first moment, you can feel like you're 10 again. Why would you ever give that up?