7 million Americans at risk of man-made earthquakes, USGS says

The U.S. Geological Survey published for the first time an earthquake hazard map covering both natural and "induced" quakes. The map and an accompanying report indicate that parts of the central United States now face a ground-shaking hazard equal to the famously unstable terrain of California.

New research revives debate over Grand Canyon's age

When we last checked in on the Old Canyon vs. Young Canyon debate, in late 2012, the Old Canyoneers had just put forth a new paper in the journal Science declaring the Grand Canyon to be roughly 70 million years old, having been excised by rivers other than the one that's currently at the bottom, the Colorado.

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