Why do humans swing their arms as they walk? Riddle answered (news.yahoo.com) 7 points by dpurp 16y ago ↗ HN
[–] RiderOfGiraffes 16y ago ↗ Submitted 5 hours earlier: http://news.ycombinator.com/item?id=730352More discussion there.
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[ 5.7 ms ] story [ 8.8 ms ] threadMore discussion there.