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The streaks on the Red Planet's surface appear to be caused by salty water, but how much water there is — and where it comes from — remains a mystery.

Addressing new allegations of corruption, FIFA President Sepp Blatter says through his attorney that he won't step down and has "done nothing illegal or improper."

Steve Inskeep speaks with NPR's Michele Kelemen about President Obama's address to the United Nations, and what it means for U.S. action on the Syrian conflict and for relations with Russia.

End poverty and hunger. Educate all kids. Fight climate change. Can the U.N. do all that while coping with the biggest refugee flow since WWII?

Palliative care nurse Theresa Brown provides in-home, end-of-life care to patients. "It's incredible the love that people evoke" at the end of their lives, she says. Brown's new book is The Shift.

President Obama and Russian President Vladimir Putin met Monday after both spoke at the United Nations General Assembly. The two have been at odds over a solution to the Syrian conflict.

Representing fields from chemistry to poetry, the 24 MacArthur Foundation Fellows will each receive $625,000 over the next five years.

A lack of crops for bees to pollinate has California's beekeeping industry on edge. Some are feeding their colonies pricey processed bee food or moving their hives out of state to forage.

Host David Greene speaks with Michele Flournoy of the Center for a New American Security and NPR's Tom Bowman about how Russian President Vladimir Putin and President Obama are approaching Syria.

The Taliban captured the northern city of Kunduz on Monday, their most important battlefield victory since they were ousted from power in 2001.