How to Flip an image

An image such as this thumb pointing up with a green sleeve represents a right hand. If we "flip" the image on a vertical axis, we arrive at a left hand: Left handed fist with thumb pointing up.  The hand comes
from a green sleeve..

So, to our great amusement someone found out about your left handed DNA image and it got reported on the The Left Handed DNA Hall of Fame. How can you fix this? Any number of image processing programs are available. On the Mac you can just click on an image and the Preview program will come up and you can 'flip horizontal'. Some open source (i.e. free) programs are:

Tom Schneider's Home Page
origin: 2005 Aug 30
updated: 2012 Feb 11