Michael J Fox (Back to the Future movie star) has Parkinson's disease which is you study in Topic 8. He has a Foundation which researches cures and treatments into the disease. One option for treatments is stem cell therapy. There are some problems with this and many ethical issues as you will discover in Topic 3.

Michael J Fox video

http://www.newscientist.com/article/dn21838-michael-j-fox-sidelines-stem-cells-for-parkinsons.html