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It's so boring, the usual human's-eye view. Seasons come and go, but terra firma itself never varies. Even an earthquake or a mudslide seems like a random incident unconnected to any larger or more complex patterns. But put on the lenses of a geologist and take another look. Reading the stories imprinted on the rocks and crystals gives scientists the ability to examine our world as it has evolved over millions, even billions, of years. From this vantage point, it is easy to see that Earth has been--and continues to be--a lively cauldron of change. Just as stop-action photography shows how buds burst into flower, geology gives us a picture of a living, changing planet. So join us for a jaunt in geology's rock-encrusted time machine. The articles in this special edition promise a rare look inside the mysterious and little-appreciated underfoot activities of the world we all call home.--The Editors 
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