Behind

As most of you know, I am a retired chartered engineer, but I have no intention of not continuing to learn. At present I am behind in my studies for a human biology degree because of my health problems, but I have not lost interest in this topic and I am very aware of my lack of knowledge in many areas of this subject. Today, to fill some gaps in this knowledge I was looking at the anatomy of the human skeleton and came across this picture looking at the skeleton from behind. I suddenly thought that this might be appropriate for my blip for today’s challenge which is behind.

Today my back is quite good although it has given me a few twinges, but I have done nothing other than sit on a hard backed chair and read.