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Fireworks have lit up the night sky in Rio de Janeiro with the start of the Olympic opening ceremony. The pageant is celebrating Brazil's history and culture, which will include music and dance.

Camp Century was a research station and test site for deploying nuclear missiles before it was abandoned under the ice in the '60s. Scientists say pollutants left behind may spread as the ice melts.

The warm, wet summer months in Puerto Rico are the perfect breeding time for the mosquitoes that carry Zika virus. As the mosquitoes multiply there, so do the human cases of infection.

Last August, 3 million gallons of orange wastewater flooded into Colorado's Animas River, ending up in Lake Powell. But Congress has failed to come up with a way to stop this from happening again.

The Friday night spectacle could be "a drug for depression in Brazil," says the creative director of the show that viewers around the world will see tonight.

The Green Party is holding its convention in Houston Saturday, the biggest in its history. Green Party presidential nominee Jill Stein is hoping to attract disaffected supporters of Bernie Sanders.

South Africa may lift a ban on the domestic trade of rhino horn. Rhino farmers say the moratorium hasn't stopped poaching, while critics say ending the ban amounts to an OK of illegal smuggling.

In a vision described as "Winning The Global Competition," the GOP nominee is proposing three tax brackets and would limit taxes on all forms of business income as well as end the estate tax.

Puerto Rico has more reported cases of Zika than many other places in the region, and the number of cases continues to rise. Unfortunately, Zika is just one of the island's many problems.

The residents of a public housing complex in East Chicago, Ind., are now forced to move because of dangerously high lead levels in the area's soil. A lead smelting company used to lie on the site.