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A U.S. probe cost $637 million to get to Mars; an Indian mission cost about a tenth as much. There are at least a few reasons why, both teams agree — starting with the differing shapes of each orbit.

The Ukrainian president, speaking in the embattled region, says: "This city was, is and will be Ukrainian."

To combat sea level rise, one of the consequences of climate change, Miami Beach is spending hundreds of millions of dollars to install new storm sewers and pumps.

Secretary of State John Kerry flies to Cairo to take part in an international conference on rebuilding Gaza, after Israel's latest military operation against Hamas militants there.

The total far surpasses the $4 billion Palestinians had said was needed after the recent 50-day war. The U.S. promised $212 million at the session, which Israel agreed not to attend.

They beat the deadly virus, but transportation back home is hard to come by. So they're living in an abandoned hospital ward, hoping someday to resume the life they had before Ebola struck.

When researchers asked young children to figure out an experiment using cause and effect, they did a much better job than young adults. That may be because their thinking is more flexible and fluid.

Charges of harassment and abuse against major players in the fashion world have put the industry under scrutiny. NPR's Lynn Neary talks to model Sara Ziff, who founded a nonprofit to protect models.

Leaders of the National School Board Association say they're concerned about "federal overreach on school meals." But the first lady maintains that now is not the time to turn back the standards.

Bits of 50,000-year-old poop have provided scientists with clues into what our early Neanderthal ancestors ate. Rather than subsisting on meat alone, the poop suggests they also ate plants.