Afghan commandos move through a smokescreen during a training exercise at Camp Commando on the outskirts of Kabul, Afghanistan. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Parallels

With The U.S. In The Background, Afghan Commandos Step It Up

With fighting expected to pick up this spring, Afghanistan's security is heavily dependent on elite forces like the commandos. NPR's Tom Bowman profiles the top enlisted man.

iStockphoto

Shots - Health News

Feds Say It's Time To Cut Back On Fluoride In Drinking Water

Excess fluoride consumption is leading to tiny white marks on many people's teeth. It's mainly a cosmetic problem, but one that could be solved by lowering the fluoride in drinking water.

A man stands near collapsed houses in Bhaktapur, on the outskirts of Kathmandu, on April 27, two days after a magnitude-7.8 earthquake hit Nepal. Aftershocks tend to get less frequent with time, scientists say, but not necessarily gentler. Prakash Mathema/AFP/Getty Images hide caption

itoggle caption Prakash Mathema/AFP/Getty Images

The Two-Way

Big Aftershocks In Nepal Could Persist For Years

Saturday's magnitude-7.8 quake released stress that was building for 150 years, scientists say, and it reshuffled tension to nearby faults. There's a 50-50 chance of a strong aftershock within a year.