Get ready for an earful on embryonic stem cell research as the World Stem Cell Summit rolls into Detroit. More than 1,200 people are expected to gather for the Oct. 4-6 conference. It is to focus on adult and embryonic stem cell research and other regenerative medical issues. Sponsors say the timing is perfect with the national debate on embryonic stem cell research playing out in a federal court and Congress. At issue: what research to allow and what should be the federal government’s role in subsidizing it. The controversy is over embryonic stem cell research.