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[BURN] At different altitudes you find different wind currents and sometimes they'll take you where you want to go.



NOVA: So what do these instrument panels tell you? [BURN]



JACK: It tells us how fast we are climbing or descending, that's up or down.



JOE: Rate of climb or descent.



JACK: Yeah, and this is your altimeter to tell you how high we are. Temperature here on the pyrometer will tell us how hot we're getting in the top of the balloon. [BURN]



JOE: Up in the top of the balloon.





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