“ Power density 50 megawatts/cm^2 -- I doubt the surface of the Sun can boast that kind of power output ... (read full comment) ” 

Posted on December 16, 2008 at 7:10 AM EST

“ Weak writing ... The author here described previous generation fuel cells as follows: "Hydrogen has a number of drawbacks. It must be derived from... (read full comment) ” 

Posted on November 14, 2007 at 6:33 AM EST