One of the most astounding supernatural changes has occurred to the human body. There have been changes in the rib structure, position of kidneys and the heart. Growing up, we always put our hand over our left chest and said the Pledge of Allegiance in school. Many still do that today, not realizing that our hearts are now actually in the middle.
If our heart was in the center, then why does everyone use their RIGHT HAND to put over their heart?
Sorry for the grossness of the picture, but "residual evidence" (the way things used to be) is hard to find:
Just in case you didn't know, this is where they say our heart is located now: