Phil Plait over at Bad Astronomy has a nice post about the recent discovery of a piece of granite in Antarctica. You may be thinking: “Oh boy, a rock in Antarctica. What’s the big deal?”
The big deal is that this specific piece of granite matches up with granite found in North America, and it means that the two continents were once attached, billions of years ago! Hooray for plate tectonics! Check out Phil’s post for the full story.