PURPLE+PROMETHIUM+PARROTS

GASES and DENSITY @http://airswimmers.com/ @http://pbskids.org/zoom/activities/sci/hotairballoon.html @http://science.howstuffworks.com/transport/flight/modern/hot-air-balloon.htm @http://www.grc.nasa.gov/WWW/k-12/TRC/Aeronautics/Hot_Air_Balloon.html @http://www.youtube.com/watch?v=i_8n3EgEs08

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