On March 9, 2009, President Barack Obama signed an executive order which lifted the ban on stem cell research put there by the Bush administration. The Bush policy banned the use of federal monies for research on human embryonic stem cell lines that were created after August 9, 2001. This policy was unpopular with many scientists who believed that stem cell lines created before that date are inadequate for the development of therapies because the technologies for creating stem cells was not advanced enough. In addition, the existing human embryonic stem cell lines were created using products derived from animals such as serum used in the media to feed the cells. This again makes the cells inadequate for regenerative therapies which involve putting stem cells in to human beings.
On the other hand, people who opposed stem cell research liked the restrictions the Bush administration put on stem cell research. Human embryonic stem cells are derived from a fertilized embryo in a dish. There are people who feel that because these cells have the potential to become a person when implanted in a woman's womb, it is unethical to do stem cell research.
It is this controversy that makes stem cell research such big news.
In any case, the lift on the ban by Obama, means that federal funds can be used to conduct research on a wider variety of stem cell lines than was previously possibly, thus enabling the search for cures and therapies for human disease
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