“ Costs? Why wouldn't Buzz want us to go to Mars? He's not going to be around to foot the bill... (read full comment) ” 

Posted on June 25, 2010 at 3:39 PM EDT

“ Or, to put it another way, Has climate changed ever stopped? (read full comment) ” 

Posted on April 30, 2010 at 8:55 AM EDT

“ UV rective phosphors, huh? Curious, what would happen when this windshield - with its red and blue phosphors that respond to UV light - was... (read full comment) ” 

Posted on March 18, 2010 at 9:44 AM EDT

“ by a very wide margin, most geothermal applications in the US are residential/commercial ground-source heat pumps. Would this potentially increase... (read full comment) ” 

Posted on July 25, 2009 at 11:50 AM EDT

“ Brain Damage in Infants The article states toward the end that injecting stems cells involves "foreign" bodies. Would it not be feasible, if such... (read full comment) ” 

Posted on January 7, 2009 at 8:57 AM EST

“ Hydropower If they can get this hydrogel to lift water 20-30 meters, that would represent a lot of potential energy, essentially for free. (read full comment) ” 

Posted on September 17, 2008 at 10:36 AM EDT

“ Don't forget the water None of the estimates of energy usage to create corn-based ethanol include the cost of the water needed to grow the corn. ... (read full comment) ” 

Posted on August 18, 2008 at 10:00 AM EDT

“ Gabrielg, go back under your rock. Exactly what is it that makes this experiement a bad thing? Think they're going to tank the results to show... (read full comment) ” 

Posted on May 8, 2008 at 8:52 AM EDT

“ Diesel Generator Can someone explain to me why no one seems to want to put a diesel engine/generator in these cars? Why stick with gasoline? ... (read full comment) ” 

Posted on May 5, 2008 at 9:56 AM EDT

“ Methane Methane should actually be considered a hydrogen delivery fuel. What makes it cleaner than the other fossil fuels is the ratio of H to C.... (read full comment) ” 

Posted on March 29, 2007 at 9:47 AM EDT