I just watched two simultaneous feeds of the NASA's Phoenix rover landing and its entry into the atmosphere of Mars. One feed came courtesy of NASA TV on the Web. The other was more produced via Discovery's science channel. The winner: NASA TV. Just hand me the live feed when the event is actually happening (also see NASA live blog). But NASA didn't win in a blow-out. When there's a lull in the action a few talking heads won't kill you on Discovery Science. However, this Phoenix rover (gallery right) bake-off shows the limitations of television. First, there's the commercial breaks. Then there's the need to justify why talking heads are around. As the Phoenix lander hit the Mars atmosphere...