Here's a fascinating Radiolab episode dealing with this subject: http://www.radiolab.org/story/91597-mix-and-match/ http://www.radiolab.org/story/91597-mix-and-

Here's a fascinating Radiolab episode dealing with this subject: http://www.radiolab.org/story/91597-mix-and-match/ http://www.radiolab.org/story/91597-mix-and-match/.