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just edited your post a bit if thats ok, it was longggg.
my fav. is the common misbelief that water in the southern hemisphere spirals down the drain the opposite direction than in the north.
http://www.snopes.com/science/coriolis.asp
definitely a 'wtf' moment when you realise you were sold a complete lie as a little kid.
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The thing that amazes me is how many people believe the water down the drain thing because a teacher, parent or other authority feature told them so when
simple observation is all that is necessary to debunk it. Watch the water going down a drain a few times. You will see that it sometimes rotates clockwise, sometimes counterclockwise, regardless of which hemisphere you are in.