The Supreme Court on Monday dismissed a long-standing appeal from scientists who tried to block funding of stem cell research on human embryos.
The field of embryonic stem cell research has been highly controversial, because in most cases, the research process involves destroying the embryo, typically four or five days old, after removing stem cells.
These cells are blank and can become any cell in the body. Because of the destruction of embryos, most opponents believe this is a moral issue. Supporters of the research point to the potential for saving lives.