The experiment that taught us what “left” really means

Left and right street arrows

Do the laws of physics know their left from their right? (Image adapted from Dean Hochman)

Can you tell your left from your right?

When I was three years old, I took significant pride in the fact that I could – particularly the day I discovered that many of my fellow preschoolers had not yet achieved this feat. Of course, as the years wore on and my classmates got the hang of it, I came to take the distinction for granted. It was so…pedestrian. Trivial, even.

And then a college professor showed up and left me so confused about left and right that I couldn’t fathom how anyone could rightly know which was which. Continue reading