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The eastern Grand Canyon was about half-carved (to the level of the red cliffs above the hiker) from 15 million to 25 million years ago, an analysis published Sunday suggests. But the inner gorge was likely scooped out by the Colorado River in just the past 6 million years. Laura Crossey/University of New Mexico hide caption

itoggle caption Laura Crossey/University of New Mexico

Science

Grand Canyon May Be Older (And Younger) Than You Think

About 6 million years ago, a new mineral analysis suggests, a mighty river zigzagging across the Colorado plateau may have found its way into older gorges, greatly enlarging them to create the West's most spectacular canyon. Still, some geologists aren't sold.

Outgoing Federal Reserve Chairman Ben Bernanke spoke about the Federal Reserve's first and next century on Thursday at the Brookings Institution in Washington. Manuel Balce Ceneta/AP hide caption

itoggle caption Manuel Balce Ceneta/AP

Economy

Bernanke's Fed Legacy: A Tenure Full Of Tough Decisions

Federal Reserve Chairman Ben Bernanke will preside over his last Fed policy-making meeting on Tuesday and Wednesday. During his two terms as chairman, he faced a global financial crisis that threatened to become financial Armageddon, followed by a deep recession.

Amanda Gerety, a staff nurse at Boston Medical Center, checks monitors that track patients' vital signs. Fewer beeps means crisis warnings are easier to hear, she says. Richard Knox/NPR hide caption

itoggle caption Richard Knox/NPR

Shots - Health News

Silencing Many Hospital Alarms Leads To Better Health Care

Alarms are good and necessary things in hospital care — except when there are so many that caregivers miss signals of a patient in crisis. Trying to conquer "alarm fatigue," one hospital turned off the beeps — and found that patient care actually improved.

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17

The eastern Grand Canyon was about half-carved (to the level of the red cliffs above the hiker) from 15 million to 25 million years ago, an analysis published Sunday suggests. But the inner gorge was likely scooped out by the Colorado River in just the past 6 million years. Laura Crossey/University of New Mexico hide caption

itoggle caption Laura Crossey/University of New Mexico

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