In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 48-49 crewmembers (left to right) Kate Rubins of NASA, Anatoly Ivanishin of Roscosmos and Takuya Onishi of the Japan Aerospace Exploration Agency prepared for a four-month mission on the International Space Station in this June 2016 photo. Alexander Vysotsky/NASA hide caption

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A 5-year-old boy, identified in news reports as Omran Daqneesh, sits in an ambulance Wednesday after reportedly being pulled out of a building hit by an airstrike in Aleppo, Syria. Mahmoud Raslan/Anadolu Agency/Getty Images hide caption

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Jamaica's Usain Bolt crosses the finish line to win the gold in the men's 200-meter final during the 2008 Summer Olympics in Beijing. Anja Niedringhaus/AP hide caption

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Omran Daqneesh sits in the back of an ambulance after he was injured during air strikes in Aleppo. Anadolu Agency/Getty Images hide caption

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In The Face Of A Bloodied Boy, A Call To Look More Deeply At Syria

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Week In Politics: Trump Campaign Shake-Ups

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Transgender Athletes Raise Questions For Future Olympic Games

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Jeni Stepien with her hand on Arthur Thomas' chest after he walked her down the aisle at her wedding last Friday. The groom, Paul Maenner, stands to the left. Lauren Demby/Lauren Renee Design hide caption

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Through Organ Donation, A Heart Lives On

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Three parasitic worms (from left): male blood fluke, which can range in size from 0.2 inches to 4 inches; tapeworm, which can grow up to 30 feet in length; and microfilaria. The images were color enhanced. David Scharf, Biophoto Associates and Eye Of Science/Science Source hide caption

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Week In Politics: Clinton's Tax Returns, Dueling Economic Speeches

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The naturalist Charles Robert Darwin, the geologist Charles Lyell and the botanist Joseph Dalton Hooker are depicted in this 19th century painting. De Agostini/A.C. Cooper/Getty Images hide caption

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40 Years Later, Anti-Doping Calls At The Olympics Grow Louder

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