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Potential answers for the unexpectedly high levels of silica all involve water. The space agency also says it found "a mineral named tridymite, rare on Earth and never seen before on Mars."

The trumpeter joined Marian McPartland in 1992 to perform "Thou Swell" and "Blue and Sentimental."

The high-tech outerwear, which can also serve as sleeping bags, are manufactured in Detroit by homeless parents to help them earn a steady income.

The California-based health care provider plans to enroll its first students in 2019. It's the latest of 20 U.S. medical schools opened in the past decade to boost the number of primary care doctors.

Anti-Muslim sentiment is on the rise, and Muslim women wearing hijabs can be particularly vulnerable. That has prompted two women in New York to organize an all-female class for observant Muslims.

The resolution does not explicitly address the contentious issue of Syrian President Bashar Assad's future in the government. It aims for an end to fighting and a focus on defeating ISIS.

Months of training culminated with reaching the summit of a 16,500-foot peak, which they named. But there were frustrations and squabbles along the away, and uncertainties as they returned to Kabul.

Rival governments in Libya have signed a U.N. peace agreement. After years of unrest, there is now hope for a unified government. NPR's Scott Simon speaks with Claudia Gazzini of the International Crisis Group.

The Tavis Smiley Show is a high-energy exchange of views, information and insight hosted by Tavis Smiley. The one-hour weekly program offers a unique…

Jeh Johnson tells NPR's Morning Edition that the existing U.S. refugee program is "probably the most thorough, multilayered, time-consuming way for anyone to cross our borders."