Mary Louise Kelly

In the past year or so, scientists have discovered more evidence for liquid water under the surface of Mars. They've found complex organic compounds — the building blocks of life. And they've found that methane levels in Mars' atmosphere vary with the seasons.

"Each of these things adds up to say that the probability of finding life on a world that's not our own is going up," says NASA Administrator Jim Bridenstine. "And Mars, I think, is that best opportunity in our own solar system to find life on another world."

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In northern Georgia, near the Tennessee line, the city of Dalton made its fame as the carpet capital of the world. These days, a more accurate title would be floor covering capital of the world. It has diversified into hardwood, tile, laminate and other materials.

When it comes to our working lives, there's a point when we're no longer in our prime. But science shows that we hit our peak professionally far sooner than we think we do.

That's the conclusion social scientist Arthur Brooks draws in a new essay in The Atlantic.

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