Three-year-old Brazilian twins who were born conjoined at the head were separated after undergoing a 27-hour surgery in Brazil. Arthur and Bernardo Lima were born in a rural part of northern Brazil in 2018. They shared part of the brain and a main vein that carries blood back to the heart. The twins underwent several operations in Rio de Janeiro under the direction of Paulo Niemeyer State Brain Institute and Gemini Untwined in the U.K. After several months of research, preparation, and using vir