How to spend $3 billion for stem cell research is proving to be a monumental and sometimes divisive task for California's Institute for Regenerative Medicine. What's the low hanging fruit in stem cell research that could move the science forward? Should funding priority be given to research that could help the largest number of people, or should it be directed to orphan diseases that affect a small segment of society and aren't of interest to big pharmaceutical companies? How much money should be spent inventing tools that could help scientists involved in stem cell research? As the stem cell institute...