I meant to say " air moves further (instead of faster)over the rounded top"
Top air movers a further distance than the bottom air in the same time, therefore it is moving faster.
Pick up a piece of typing paper by the bottom two edges then bring it straight up in front of your face letting the top part roll over your hands draping away from you (huh?) Now blow hard above and across the part that is rolled over your hands and it will rise up - straight out if you blow hard enough. That"s how an aircraft rises into the lower pressure air. (And you thought it was magic!)
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