Environment

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Two Sumatran tiger cubs were born at the Smithsonian National Zoo (Photo courtesy of Smithsonian National Zoo)

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Jack N. Gerard of the American Petroleum Institute said Congress should act on bills that would end the renewable fuels standard. (The Washington Times)

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Director Lee Daniels, left, and actor Forest Whitaker attend a special screening of "Lee Daniels' The Butler" hosted by O, The Oprah Magazine last month in New York. (Photo by Evan Agostini/Invision/AP)

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Pakistani soldiers rescue local residents from an area flooded by heavy rains on the outskirts of Karachi, Pakistan, on Aug. 4, 2013. Heavy rains that swept across Pakistan brought down more than 100 homes and caved in a factory wall, killing at least a dozen people in the downpours, officials said. (Associated Press)

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Peacemaker: "There is no war on coal," Energy Secretary Ernest Moniz said last week, contradicting others in the Obama administration who are pushing hard to limit carbon emissions. (Associated Press)

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**FILE** In this image provided by the Centers for Disease Control and Prevention, a photomicrograph of a fresh stool sample, which had been prepared using a 10% formalin solution, and stained with modified acid-fast stain, reveals the presence of four Cyclospora cayetanensis oocysts in the field of view. Iowa and Nebraska health officials said on July 30, 2013, that a prepackaged salad mix is the source of a cyclospora outbreak that sickened more than 178 people in both states. Cyclospora is a rare parasite that causes a lengthy gastrointestinal illness. (Associated Press/Center for Disease Control and Prevention)

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Flying is still the safest form of mass transit. Your odds of being killed in a plane crash are 1 in 11 million.

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Actor Scott Schwartz fires his "Red Rider BB gun" in 1983's "A Christmas Story." (Image: Metro-Goldwyn-Mayer)

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A bus goes up in flames in Bogra, some 120 kilometers (75 miles) north of Dhaka, Bangladesh, on Aug. 1, 2013, after being set on fire by activists in Bangladesh's Jamaat-e-Islami party after the Bangladesh high court disqualified the party from taking part in the next general election. The High Court panel ruled that the country's largest Islamic party’s regulations violate the constitutional provision of secularism. (Associated Press)

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The restored space shuttle Galileo from the 1960's television show Star Trek is unveiled at Space Center Houston Wednesday, July 31, 2013, in Houston. (AP Photo/Pat Sullivan)