Corals around the world have been dying because of warming waters and pollution. Some researchers hope they can reverse the trend by growing new corals in the lab.
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As the date for North Korea's missile launch toward Guam approached, protesters held a peace rally in Hagatna, Guam. On Tuesday, North Korea's regime opted not to launch missiles toward the U.S. territory.
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Then-Joint Chiefs Chairman Adm. Michael Mullen testifies on Capitol Hill in Washington, in 2011. Mullen, who retired six years ago, has expressed concern about escalating tensions with North Korea.
Afternoon traffic passes in front of a wall painted with the flags of the U.S. and Guam in the Tumon district on the island of Guam on Friday. The island has become a talking point in the rhetoric coming from President Trump and North Korea.
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At railway station in Seoul on Wednesday, a South Korean soldier walks past a television screen showing a graphic of the distance between North Korea and the U.S. territory of Guam.
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