Wag the dog: When left vs. right matters

The asymmetry in a dog wag could mean more than you think

By Bethany Brookshire, 16:48 PM November 1, 2013

Most of us see a wagging dog’s tail and think it’s got to be a good sign. Wagging = welcome, right? Especially if it’s the kind of wag that’s knocking over small items.  But it turns out that not all wags are equal, and some are a lot more welcoming than others.  

When I walked into my college biology course freshman year, we started out with a discussion of symmetry. Most animal are built with some symmetry, either radial or bilateral — radial like a starfish, bilateral like a human. Symmetry...

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