Grow way-cool crystal geodes with just a few household basics. 1. Help kids crack an egg at the narrow end and carefully widen the opening to the size of a quarter. Empty into a bowl; repeat with ...

The crystals must be at least 60,000 years old, the team found, because that was the youngest age of a bit of carbonate crust growing on one of the largest crystals in the geode. Since the crust ...

It’s also very difficult to produce them in the laboratory.” Instead, researchers look to the surrounding rock and the geodes themselves for clues to their origin. Fiorella Arduin Rode ...