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        "description": "<p>Understanding how rockets work is not exactly  \"rocket science.\"  Richard Ambrose and Jonny Phillips demonstrate how basic physics is responsible for launching space shuttles and fireworks up into the air.</p>", 
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        "title": "I Didn't Know That: How Rockets Work", 
        "url": "http://video.nationalgeographic.com/video/science/weird-science-sci/idkt-how-rockets-work/", 
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                    "url": "http://science.nationalgeographic.com/science/", 
                    "name": "More About Science"
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        "credit": "National Geographic", 
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        "transcript": "<p>JONNY PHILLIPS Of all the different methods of propulsion invented by mankind, for pure, unadulterated, heart stopping excitement nothing really compares to rockets.</p><p>RICHARD AMBROSE: OK - I am about to initiate the launch sequence.\u00a0 Now stand right back and witness the explosive power of rocketry. Whoa!</p><p>JONNY PHILLIPS (SYNC - TO RICHARD): Um - I think we're gonna need bigger rockets, don't you?</p><p>NARRATOR: Well boys, how about the biggest rocket of all time?\u00a0 Imagine 50 jumbo jets at full power, strapped to a 36 storey building.\u00a0 That's Saturn 5.</p><p>It takes something like this to catapult man to the moon.\u00a0 But where does the colossal thrust actually come from?</p><p>RICHARD AMBROSE (PTC): Inside a rocket motor fuel is turned into gas through combustion and the gas is then forced out the back.\u00a0 And the reason why escaping gas pushes a rocket forward is explained by Newton's Third Law of Motion.</p><p>JONNY PHILLIPS (PTC): Which is, as I'm sure you'll remember from school, that every action has an equal and opposite reaction.</p><p>RICHARD AMBROSE (PTC): That's the theory but what we need is a practical demonstration.\u00a0 Now as Jonny opens the valve on this pressurized gas canister the air will rush out but at the same time an equal and opposite force will propel it this way. Go on Jonny - open it up.</p><p>JONNY PHILLIPS (PTC): So there you have it.\u00a0 The basics of rocketry.\u00a0 Well what did you expect?\u00a0 It's not rocket science.</p><p>NARRATOR: The rocket's launch speed does not depend on the astronaut flooring the throttle but on how quickly the gas escapes from the exhaust.</p><p>Space rocket exhausts are hour glass shaped because gas flows at an accelerated rate if it's forced through a narrow section into a wider end.</p><p>NARRATOR: The exhaust is crucial no matter what the size of the rocket.</p>", 
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