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A wall is worse than a cube as well right? Basically holding up a sheet of plywood is worse. As pointed out it's all about speed. I can hold up that sheet and walk with it and not notice the aero drag but try an old it up in the back of a pickup on the highway and there will be an injury involved. I'm glad he mentioned the size as well because while I couldn't hold a sheet of plywood up at speed I could hold a playing card up which both have the same Cd.
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