“ In this system, during operation, there is no slip and therefore no energy lost to friction. Friction is why the tires pressed up against the... (read full comment) ” 

Posted on December 5, 2009 at 1:14 PM EST

“ Actually even enriched nuclear fuel would be useless for this technology. To see why, we must consider the actual obtainable power: Whenever a... (read full comment) ” 

Posted on November 17, 2009 at 12:32 PM EST

+ 1 more comment posted in this discussion

“ Actually 60 bits/s is probably almost bang on for human reading comprehension. Say you are correct about 7 words/s, and the average English word... (read full comment) ” 

Posted on August 26, 2009 at 2:08 PM EDT

“ The figure of 70 kW/kg is almost certainly true - but it is not a the energy density per system weight, rather it is just the thin film... (read full comment) ” 

Posted on April 27, 2009 at 12:04 PM EDT