Quote:
Originally Posted by Dvae
Why do you think we have "tailbones"?
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used to walk on all fours evidenced by our sinuses draining 'upward' as opposed to 'downward'
had we been designed from the jump to walk 'upright' our sinuses would drain downward from a standing position. the way it is now our sinuses will only drain downward if our heads are hanging, such as being on all fours.