While the Nature study looked at how a bird flu virus could become airborne through mutations and re-assortment with other viruses, the Science study suggests mutations alone could do the trick.
But one of the Science studies suggests that such "re-assortment" may not be necessary to give rise to a pandemic strain, and that it might emerge from mutations in H5N1 alone.
Naturally Acer's taken to skinning Gingerbread a bit here -- there's an assortment of Acer widgets as well as that retooled homescreen you're seeing in the picture above.