Why Are Stem Cells so Controversial?

The paper that I am writing today deals with one of the most talked about topics to this day. Politicians win or loose elections, scientists gain funding for research, or are forced to move to countries that allow this type of research to be continued in their nation; people with numerous disabilities come closer or float further away from their dream of one day being cured of their disease. My topic is stem cell research. What are those cells and what is so remarkable about them to produce so much controversy?
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