Science

In experiments involving people with epilepsy, targeted zaps of the lateral orbitofrontal cortex region of the brain helped ease depressive symptoms. Getty Images hide caption

American biologist David Baltimore criticized a fellow scientist who claims he has edited the genes human embryos during the Second International Summit on Human Genome Editing at the University of Hong Kong. China News Service/VCG via Getty Images hide caption

Researcher He Jiankui spoke Wednesday during the 2nd International Summit on Human Genome Editing in Hong Kong. Kin Cheung/AP hide caption

Tianjin, in northern China, is home to Tianjin University, an international research center that recently hired an American to lead its school of pharmaceutical science and technology. He recruits students from all over the world, he says, and the program's classes are taught in English. Prisma Bildagentur/UIG/Getty Images hide caption

Genetics researcher He Jiankui said his lab considered ethical issues before deciding to proceed with DNA editing of human embryos to create twin girls with a modification to reduce their risk of HIV infection. Critics say the experiment was premature. Mark Schiefelbein/AP hide caption

NASA engineers on the flight team celebrate the InSight spacecraft's successful landing on Mars at the NASA Jet Propulsion Laboratory in Pasadena, Calif., on Monday. Al Seib/AFP/Getty Images hide caption

Dr. Ruth Levesque (right) hands Shaun McDougall his newborn son Brady at South Shore Hospital in Weymouth, Mass. The birth of the second twin, Bryce, was much trickier than Brady's. Good communication between the health team and parents was crucial to safely avoiding a C-section, obstetricians say. Jesse Costa/WBUR hide caption