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Back in the 1920s, the U.S. government thought blimps might be the next big thing in warfare. So the government started producing helium. And they created the Federal Helium Reserve, a vast store of helium that sits underground in the Texas panhandle.

When Laura Kate Whitney enrolled her 4-year-old, Grey, at Avondale Elementary, a public school in Birmingham, Ala., she and her husband were bucking a trend. Whitney and her husband are white, middle-class professionals. Public schools in Birmingham are 95 percent black, and 90 percent of the students are on free or reduced lunch.

Whitney's is one of about two-dozen similar families who are not buying into the conventional tradeoff that if you live within city limits and have means, you send your kids to private schools.

Aurora, Colo., became a familiar name this summer, in the wake of a mass shooting at a local movie theater.

But there's much more to this Denver suburb than the recent tragedy. Just ask Ethiopian immigrant Fekade Balcha. Balcha's apartment, on Aurora's north side, sits in a dense neighborhood of squat brick apartment buildings and tiny homes.

"You see, in our apartment, there are Russians, Mexicans, Africans," Balcha says. "From Ethiopia, Somalia, Nigeria, and something like that."

After one of the driest summers on record, recent rains have helped in some parts of the country. But overall, the drought has still intensified. The latest tracking classifies more than a fifth of the contiguous United States in "extreme or exceptional" drought, the worst ratings.

In some parts of the Lower Midwest, water-starved crops have collapsed, but the farmers have not. Farmers across the country are surviving, and many are even thriving. This year, despite the dismal season, farmers stand to make exceptionally good money, according to the U.S. Department of Agriculture.

NASA's Curiosity rover has found definitive proof that water once ran across the surface of Mars, the agency announced today. NASA scientists say new photos from the rover show rocks that were smoothed and rounded by water. The rocks are in a large canyon and nearby channels that were cut by flowing water, making up an alluvial fan.

"You had water transporting these gravels to the downslope of the fan," NASA researchers say. The gravel then formed into a conglomerate rock, which was in turn likely covered before being exposed again.