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Old 02-07-2005, 10:07 AM   #1 (permalink)
salividor
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interesting fizyks

couple of questions i came across on my travels:
1) why do molecules of the air not fall to the ground and stay there? (i have a feeling it may be due to convection and pressure but not sure)
2)why does the top of a pond freeze long before the middle and bottom?
3)finally why do stars look red, white or blue but never other colours like green etc.

any ideas would be cool, cheers
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