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Calvin's Dad: "Because the hot air rose all the way to space and isn't on the mountain anymore."
That must be why it's still warm in aeroplanes that fly higher than Everest.
Also why cold air balloons never took off
Oh, they did take off.... They just went "ppthhlppppsssssssspplpssseeeeeeeethstsplpssseeeeeeeesssssssss" and fell to the ground again.
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