A doctor claims to have cloned human embryos and implanted them in women. April 23, 2009— -- A controversial fertility doctor claims to have cloned human embryos and implanted them into four ...

Can one be an advocate for embryonic stem cell research while opposing human cloning experimentation? That's the question facing about 30 U.S. senators who have not yet taken a position on human ...

Researchers in South Korea on Thursday announced they succeeded in extracting stem cells from a cloned human embryo. Following a background report on the science behind the research, Margaret Warner ...