Scientists theorize that seas of liquid diamond--yes, you read that right, liquid diamond--may exist far beneath the clouds of gas giant planets like Uranus and Neptune. For the full story, check out THIS article from physorg.com.
As I've gotten older, I'm always afraid I'm going to become bitter and jaded. But then I read about something fantastic like this, and I once again feel the stirring of that all-important sense of wonder about the world and universe that we live in. Liquid diamond oceans? Cool!