Anyone who's pursued geology on the web enough has run into the expanding-Earthers, a set of people who parrot the long-discredited theory once put forth by respected geologists that the planet's configuration is best explained by having it growlike double in size since the dinosaurs' days. Their most cherished persuasive tool is the animation, which shows the world shrinking until its continents all tuck neatly together. They really do! But that's because of the way plate tectonics works. Once you realize that, the animation gains a certain perverse charm, like an optical illusion. I've put the details in this article.
I'm renewing this post, first written in August 2010, because I've touched up the article and because unbeknownst to most of you, the expanding-Earthers have been commenting here ever since. If you've never seen them in action, this is typical.