Humans Can't Walk or Swim Straight

Just saw this news story: www.newser.com/.../humans-cant-walk-straight-scientists.html It's so true. Some mornings I try swimming with my eyes closed, and I can't go more than three strokes without hitting the lane line. But according to the article, no one knows why this is the case. And makes me all the more impressed with blind people who get around just fine.
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