Realism in TV is overrated. Now, that's not to say that things that are horribly impossible, as related to our everyday life are good to have; I think they can ruin a series. But bending the physical laws, having prodigies that wouldn't normally occur, that's what TV's about
: escapism.
Suspension of reality is what you need. Sure, things aren't always realistic and you could watch a show pointing out all the things that are impossible or highly improbable and not enjoy the show at all. Or you could suspend your disbelief and watch it for the entertainment it's supposed to be.
NOTE: This is not related to the whole Firefly/Serenity thingy, but it is applicable since that's how I view TV/Movies in general

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Courage doesn't always roar. Sometimes courage is that little voice at the end of the day that says "I'll try again tomorrow".
Maturity is knowing you were an idiot in the past. Wisdom is knowing that you'll be an idiot in the future.
Download the
Nosral Confederacy (a shipset based upon the Phong) and the
Tyrellian Imperium, an organic looking shipset I created! (The Nosral are the better of the two [img]/threads/images/Graemlins/Grin.gif[/img] )