The Cathedral Spires in the Black Hills of South Dakota are just one of innumerable formations across the planet that speak to the Earth's ancient history.
K. Scott Jackson/Ohio Water Science Center/USGS
November 26, 2013 Feeling a little blue recently, commentator Adam Frank retreated to a hilltop and found something he wasn't looking for: perspective. The breadth of time stretched out before him and opened his eyes to our place in an ongoing story.
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