From WMOT News A Chemical Eye on "Sweet Thang" WMOT Published March 27, 2006 at 9:52 AM CST Facebook Twitter LinkedIn Email By Preston MacDougallhttp://stream.publicbroadcasting.net/production/mp3/wmot/local-wmot-505029.mp3Murfreesboro, TN – Why is that diet cola so sweet? Dr. Preston MacDougall has an explanation.