The curvature of the Earth would mean that two vertical walls would get further apart as you get further above the Earth's surface. To make them parallel would mean that one or both would not be exactly vertical.
Nov 07 02, 11:19 PM
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This film was made in the darkest days of WW2. It portrayed the attempt by a group of German U-Boat survivors to escape from Canada to the neutral United States. It's often on TV. How much do you know about it?
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