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A human embryo kept alive in the lab for 12 days begins to show signs of early development. The green cells seen here in the center would go on to form the body. This embryo is in the process of twinning, forming two small spheres out of one. Courtesy of Gist Croft, Cecilia Pellegrini, Ali Brivanlou/Rockefeller University hide caption

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Courtesy of Gist Croft, Cecilia Pellegrini, Ali Brivanlou/Rockefeller University

Shots - Health News

Embryo Experiments Reveal Earliest Human Development, But Stir Ethical Debate

Researchers who study developing human embryos have long limited their experimentation to lab embryos that are no more than 14 days into development. Some scientists are now pushing that boundary.

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She's So High Tal Bachman
Wanna Be (Radio Edit) Spice Girls

A human embryo kept alive in the lab for 12 days begins to show signs of early development. The green cells seen here in the center would go on to form the body. This embryo is in the process of twinning, forming two small spheres out of one. Courtesy of Gist Croft, Cecilia Pellegrini, Ali Brivanlou/Rockefeller University hide caption

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Courtesy of Gist Croft, Cecilia Pellegrini, Ali Brivanlou/Rockefeller University

Embryo Experiments Reveal Earliest Human Development, But Stir Ethical Debate

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Maria Caracoles Santana

Iraqis walk at the Hamam al-Alil camp for displaced people, south of Mosul, on Wednesday, during an offensive by security forces to retake the western parts of the city from ISIS fighters. Aris Messinis/AFP/Getty Images hide caption

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Aris Messinis/AFP/Getty Images

Civilians Flee As Iraqi Army Battles Remaining ISIS Fighters In Mosul

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Maziden Orhan Osman
Iris The Goo Goo Dolls
Ice Ice Baby Vanilla Ice

"The job of the media is the accountability of government," says CNN President Jeff Zucker. "And I think we are uniquely positioned to do that with our resources and our reach." Mike Coppola/Getty Images for Turner hide caption

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Mike Coppola/Getty Images for Turner

Amid Trump Attacks And Snubs, Zucker's CNN Reclaims Newsy Mission

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Frozen Tides Electus
Wonderwall Oasis

Tyler Cowen argues, in his new book The Complacent Class, that Americans are in a period of stagnation because we are doing less and less of what made us successful in the past: embracing change, moving to different parts of the country and associating with different kinds of people. mathisworks/Getty Images/iStockphoto hide caption

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mathisworks/Getty Images/iStockphoto

America's 'Complacent Class': How Self-Segregation Is Leading To Stagnation

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Party like it's 1999 Prince
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Genie in a Bottle Christina Aguleira
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Waiting For Tonight Jennifer Lopez

Tubes of hematite, an iron-rich mineral, might be evidence of microbial life that lived around underwater vents billions of years ago. Matthew Dodd/University College London hide caption

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Matthew Dodd/University College London

Tiny Fossils Could Be Oldest Evidence Of Life On Earth

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Scherben Dramadigs
Bittersweet Symphony/Waterloo Sunset Brad Mehldau
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As Long As You Love Me Backstreet Boys
Summer Girls LFO

The Capitol of Puerto Rico, Capitolio de Puerto Rico, in San Juan. Puerto Rico is under federal control, but isn't allowed voting representation in Congress, and residents can't vote for president. Greg Allen/NPR hide caption

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Greg Allen/NPR

Puerto Ricans Reflect On A Century Of (Limited) Citizenship

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