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FILE - This Friday, April 14, 2017, file photo provided by the Arizona Department of Public Safety shows the mangled remains of cars involved in a fatal accident on the Northbound Interstate 17 in Phoenix, Ariz. Arizona transportation officials are moving forward with a first-in-the-nation pilot program that will use thermal camera technology to curb the wrong-way driving problem plaguing the state. The wrong-way detection system will illuminate a sign that notifies the wrong-way driver, and immediately alert the state Department of Public Safety. Arizona Department of Transportation officials will update message boards along the interstate that cautions other drivers of the wrong-way vehicle. (Arizona Department of Public Safety via AP)

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Vanessa Castagnoli, of Tentsile, shows Eric Hanson, the Stingray tree tent, at the Tentsile display during Outdoor Retailer show Thursday, July 27, 2017, in Salt Lake City. Hybrid hammock-tents that allow people to sleep under the stars or chill out while dangling from the trees are growing in popularity among outdoor enthusiasts who are embracing the idea of these portable treehouses. (AP Photo/Rick Bowmer)

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Vanessa Castagnoli, of Tentsile, shows Eric Hanson, the Stingray tree tent, at the Tentsile display during Outdoor Retailer show Thursday, July 27, 2017, in Salt Lake City. Hybrid hammock-tents that allow people to sleep under the stars or chill out while dangling from the trees are growing in popularity among outdoor enthusiasts who are embracing the idea of these portable treehouses. (AP Photo/Rick Bowmer)

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Tom Hennessy climbs in to a hammock at the Hennessy Hammock display during Outdoor Retailer show Thursday, July 27, 2017, in Salt Lake City. Hybrid hammock-tents that allow people to sleep under the stars or chill out while dangling from the trees are growing in popularity among outdoor enthusiasts who are embracing the idea of these portable treehouses. (AP Photo/Rick Bowmer)

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Tom Hennessy sits in a hammock at the Hennessy Hammock display during Outdoor Retailer show Thursday, July 27, 2017, in Salt Lake City. Hybrid hammock-tents that allow people to sleep under the stars or chill out while dangling from the trees are growing in popularity among outdoor enthusiasts who are embracing the idea of these portable treehouses. (AP Photo/Rick Bowmer)

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People look at the Treepod display during Outdoor Retailer show Thursday, July 27, 2017, in Salt Lake City. Hybrid hammock-tents that allow people to sleep under the stars or chill out while dangling from the trees are growing in popularity among outdoor enthusiasts who are embracing the idea of these portable treehouses. (AP Photo/Rick Bowmer)

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Ricardo Bottome, of Treepod, is shown at the Treepod display during Outdoor Retailer show Thursday, July 27, 2017, in Salt Lake City. Hybrid hammock-tents that allow people to sleep under the stars or chill out while dangling from the trees are growing in popularity among outdoor enthusiasts who are embracing the idea of these portable treehouses. (AP Photo/Rick Bowmer)

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FILE- In this July 4, 2017 file photo, distributed by the North Korean government shows what was said to be the launch of a Hwasong-14 intercontinental ballistic missile in North Korea. North Korea fired a ballistic missile Friday night, July 28, which landed in the ocean off Japan, Japanese officials said. (Korean Central News Agency/Korea News Service via AP, File)

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Environmental Protection Agency Administrator Scott Pruitt hasn't said one way or the other whether he plans to pursue the endangerment finding, which provided the legal underpinning for much of the Obama administration's agenda inside the agency. (Associated Press/File)

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In this July 4, 2017, file photo, distributed by the North Korean government shows what was said to be the launch of a Hwasong-14 intercontinental ballistic missile in North Korea. North Korea fired a ballistic missile Friday night, July 28, which landed in the ocean off Japan, Japanese officials said. (Korean Central News Agency/Korea News Service via AP, File)

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Vacationers head north on NC 12 on Hatteras Island, N.C., on Friday, July 28, 2017. An estimated 10,000 tourists face a noon deadline Friday for evacuating the island on North Carolina's Outer Banks after a construction company caused a power outage, leaving people searching for a place to eat, stay cool or to resume interrupted vacations. (Steve Earley/The Virginian-Pilot via AP)

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Russian Space Agency experts help to U.S. astronaut Randy Bresnik, member of the main crew to the International Space Station (ISS), to sit during inspecting his space suit prior the launch of Soyuz-FG rocket at the Russian leased Baikonur cosmodrome, Kazakhstan, Friday, July 28, 2017. (AP Photo/Dmitri Lovetsky)

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Customers enter the darkened Island Convenience Store in Rodanthe on Hatteras Island, N.C., on Friday, July 28, 2017. An estimated 10,000 tourists face a noon deadline Friday for evacuating the island on North Carolina's Outer Banks after a construction company caused a power outage, leaving people searching for a place to eat, stay cool or to resume interrupted vacations. (Steve Earley /The Virginian-Pilot via AP)

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Aaron Howe cooks in the dark kitchen at the Island Convenience Store in Rodanthe on Hatteras Island, N.C., on Friday, July 28, 2017. An estimated 10,000 tourists face a noon deadline Friday for evacuating the island on North Carolina's Outer Banks after a construction company caused a power outage, leaving people searching for a place to eat, stay cool or to resume interrupted vacations. Howe says it is the only place in town to get a meal. (Steve Earley /The Virginian-Pilot via AP)

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The sun shines through the window at midnight as researcher Ilona Mettiainen reads in a room overlooking an observation deck on the Finnish icebreaker MSV Nordica as it sails the Bering Sea toward the Canadian Arctic Archipelago to traverse the Northwest Passage, early Friday, July 14, 2017. Mettiainen is working on her doctorate in sociology and is exploring how climate change affects Arctic communities. Mettiainen grew up in Rovanaiemi, Finland, close to the Arctic circle. "When I was a kid I couldn't really sleep when there was daylight in the evening," said Mettiainen. "I'm used to it now since my childhood so it's a home thing for me. It feels like home." (AP Photo/David Goldman)

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Sunlight is cast over the sea ice at midnight as Master Mariner Jyri Viljanen, captain of the Finnish icebreaker MSV Nordica, sips a cappuccino while overseeing the navigation of the Northwest Passage through the Victoria Strait in the Canadian Arctic Archipelago, early Saturday, July 22, 2017. Viljanen has been going to sea for 39 years and is making his first transit through the Arctic's Northwest Passage. "It's once a lifetime," said Viljanen of the opportunity. (AP Photo/David Goldman)

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In this Wednesday, July 26, 2017 photo, a tiger receives medical treatment from a health care member of the Four Paws organisation, in Bursa, northwestern Turkey, after it was rescued from an amusement park near the embattled city of Aleppo, Syria. Austria-based Four Paws evacuated nine animals total, two bears, three lions, two hyenas and two tigers which all survived intense clashes on Syria's civil war around the Aleppo region. (AP Photo/Emrah Gurel)

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In this July 27, 2017 photo, children play with a foam board in the polluted Guanabara bay, in Rio de Janeiro, Brazil. Rio organizers promised to clean up polluted Guanabara Bay in their winning bid in 2009. During the Olympics, officials used stop-gap measures to keep floating sofas, logs, and dead animals from crashing into boats during the sailing events. Since the Olympics, the bankrupt state of Rio de Janeiro has ceased major efforts to clean the bay, with the unwelcome stench usually drifting along the highway from the international airport. (AP Photo/Silvia Izquierdo)

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In this July 27, 2017 photo, trash lays on the coast of Guanabara bay in Rio de Janeiro, Brazil. Rio organizers promised to clean up polluted Guanabara Bay in their winning bid in 2009. Since the Olympics, the bankrupt state of Rio de Janeiro has ceased major efforts to clean the bay, with the unwelcome stench usually drifting along the highway from the international airport. (AP Photo/Silvia Izquierdo)

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In this July 27, 2017 photo, trash lays on the coast of Guanabara bay, in Rio de Janeiro, Brazil. Rio organizers promised to clean up polluted Guanabara Bay in their winning bid in 2009. During the Olympics, officials used stop-gap measures to keep floating sofas, logs, and dead animals from crashing into boats during the sailing events. Since the Olympics, the bankrupt state of Rio de Janeiro has ceased major efforts to clean the bay, with the unwelcome stench usually drifting along the highway from the international airport. (AP Photo/Silvia Izquierdo)