Sliding down memory lane (This classic Dave Barry column was originally published April 13, 2003.) Recently, my little brother Phil (he's only 50) gave me a box that wound up with him some years ago, when our mom died and a bunch of family flotsam drifted down one generation. The box contains slides. For you young digital readers, I should explain that slides are transparencies made from photographs. They used to be very popular. When you wanted to look at big, bright images of your vacation, you'd get out your slides, spend a few seconds thinking about what a pain...