Expectations of huge financial and medical returns on California's $3 billion investment in stem cell research are unrealistic and based on overblown analysis, according to a study by a panel of research, business and academic professionals. The biggest benefit Californians can expect to reap from their investment – improved quality of life for people living with devastating diseases – is at least 20 years away, the report said. In the meantime, the state should quickly make basic scientific discoveries and tools made with the taxpayers' investment available to the broad scientific community to further stem cell research, the report said....