By Pamela Tran, Alabama Public Radio
http://stream.publicbroadcasting.net/production/mp3/wual/local-wual-672107.mp3
Tuscaloosa, AL – In our continuing series -- "Wow! I Didn't Know That!" -- we turn our attention to something that gets a lot of attention. It comes in all shapes and colors, and sometimes -- it's not even there at all. Alabama Public Radio's Pamela Tran reports.