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Dec
20
revised Which ball touches the ground first?
Changed last occurrence of "ball 1" into "ball 2". Removed some additional character to surpass the edit limit.
Jul
9
revised Metronome synchronisation applied to swings
deleted 2 characters in body
Mar
9
revised Effective angle of attack of a wing
added images to show how I see this problem
Nov
6
revised Force in tetrahedron edges
Added clarification following an answer