Re:Amazing (Score 2, Interesting)

Most breakthrough technologies are unimpressive compared to what they eventually replace, but they start the game at the bottom of the technology "curve" so they have plenty of room to improve. (Common example: new data storage technologies often don't store more than the previous ones, but they make up for it by being smaller/cheaper/more efficient) Also, you wouldn't have to surpass the energy density of fossil fuels if you could translate more of the energy into work. IIRC, current car engines waste almost 60% of the energy in gas creating heat.