“Carl Zimmer”:http://www.corante.com/loom has a good discussion of the discovery that the embryonic stem-cell lines approved by the Bush administration appear to be “contaminated”:http://corante.com/loom/archives/of_stem_cells_and_neanderthals.php with sugars from the substrate they were originally grown in. He has a nice angle on whether the Intelligent Design types who disagree with stem cell research will try to rely on the paper describing the discovery, which demonstrates the problem with the the cell lines by drawing on evidence about molecular evolution.