There's a lot of controversy over this one.
An announcement by an American company that it has created a human embryo clone is being viewed as both an incredible scientific achievement and a dangerous step.
In 2005, British scientists announced they had successfully cloned the country's first human embryo. The only thing they plan to do with this research is to use cells from the embryos to help treat disease in the future.
It was made illegal to clone embryos to make babies in 2001.
Opponents of cloning say cloning humans is very wrong because it goes against nature.