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Health officials in Houston, Texas, have discovered mosquitoes carrying the virus that causes St. Louis encephalitis in seven areas of the city. NPR's Wade Goodwyn travels with one of the health department's "mosquito men" as he makes his way through Houston's extensive sewer system, trapping mosquitoes and sending them back to the lab for testing. (6:15) CORRECTION, aired on All Things Considered Sept. 6, 2001: Wade Goodwyn's report about a mosquito surveillance officer in Houston brought out the science police in the audience. Dr. Victor Sloan of Scotch Plains, N.J., writes this: "In Wade Goodwyn's excellent story on Houston's mosquito hunters, he said 'when the dry ice melts.' Melting is the act of a solid becoming liquid. Dry ice does not melt, it sublimes. That is, it goes directly from a solid to a gas, without ever becoming liquid. When I was about 10, my father tried to explain this to me. It took me years to believe him."

Baseball is sometimes called the "timeless game." Unlike other sports, there's no game clock. Theoretically, the game could go on forever. Four decades ago, one game came close.

Baseball is sometimes called the "timeless game." Unlike football, basketball or soccer, there's no clock. Theoretically, the game could go on forever. Four decades ago, one game came close.

With each launch, SpaceX has been discharging tens of thousands of gallons of industrial wastewater into sensitive wetlands. Environmentalists say an increase in launches will only make things worse.

The map was drawn by South Carolina's Republican-controlled legislature and challengers said was a racial gerrymander.

It's the world's biggest coral reef system, home to some 400 types of coral. In the past 18 months, rising ocean temperatures helped cause the single greatest loss of coral ever recorded there.

NPR's Michel Martin visits the National Memorial for Peace and Justice, founded by attorney Bryan Stevenson, to memorialize the victims of lynchings that took place in the U.S. after the Civil War.

The prime minister says Canada will stop its airstrikes within two weeks, and will step up training for local security forces fighting ISIS militants.

Water tests by the state environmental agency did not find dangerous levels of a corrosive chemical, after a leak from an asphalt plant led to a citywide drinking water ban beginning Dec. 14.

Oil sits under a pristine swath of the rainforest. Ecuador promised to leave the forest untouched — if the rest of the world would pay up.