R and L

One of the earbuds on my headphones broke.  So I was listening to my radio and books and music with only one earbud.  Barb went out and bought me some fancy new headphones.  They were noise reducing but they didn't feel right in my ears sometimes.  Finally I realized that the earbuds were different shapes and there was one for the right ear and one for the left ear.  Now I have to always check the earbuds for the little R or L before I put them on.