“ Species in space While the relationship is interesting, the fact that humans and bird share a common ancestor is moot. If you go back far enough,... (read full comment) ” 

Posted on July 15, 2009 at 10:55 AM EDT

“ Looking for tunelling? Would the "shining light through a wall" effect be any less effective if the wall were a mirror? If tunneling is what... (read full comment) ” 

Posted on June 5, 2009 at 11:43 AM EDT