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In Brazil, the countdown has begun for the 2016 Summer Olympics. Brazilian organizers say everything is on track, but concerns persist over the water quality for some of the events.

A listener responded to our invitation to send recordings of backyard wildlife with audio of a spooky bird screech. An expert at the Cornell Lab of Ornithology helped solve the mystery.

There is a fire at a chemical plant in Crosby, Texas. The plant is flooded and is not able to cool the volatile chemicals stored there. Ailsa Chang talks to Al Ortiz of Houston Public Media.

A skeleton crew at Houston's Johnson Space Center is tasked with "keeping the lights on" at the International Space Station. NASA flight director Royce Renfrew says they are locked in due to flooding.

As Harvey continues to dump damaging rain on the south, some researchers are looking at new ways to quantify the power of a big storm.

Sam Brody, a professor at Texas A&M at Galveston, talks with Ailsa Chang about how Houston area levees, reservoirs, dams and bayous have been holding up during the storm.

Andrew Young, former mayor of Atlanta and African-American civil rights activist, says the fight to remove monuments memorializing the Confederacy alienates potential civil rights allies.

A controversial Energy Department report says the U.S. power grid could become less reliable if too much electricity comes from renewable energy and natural gas. Environmentalists doubt the report.

The Navy has named all 10 of the sailors but has confirmed only one set of remains. Divers were searching flooded compartments on the destroyer, which is now docked in Singapore.

Fire season is Montana began early this year, and the blazes continue to burn larger than in average years. Meteorologists say they're being fueled by something called a flash drought.