Cloning an animal is a tedious and difficult process, as shown by six calves cloned by scientists at the U.S. Agriculture Department. So many observers are skeptical of claims of an imminent human clone. NPR's Joe Palca reports.
Copyright 2002 NPR
Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.