[msiyer]

The complexity is mind boggling. Physically, we are not what we were a few months ago. And what exactly is physicality?

People were commenting that the idea that every cell is replaced in a living organism is 'laughable'. Brain cells and osteocytes were cited as examples of cells that are never replaced.

However, I still think, and more strongly than ever, that brain cells and osteocytes can be examples of unchanging cells if an only if it is proven beyond a shadow of doubt that every single atom constituting such cells remains intact during the lifetime of such cells.

Since the human body is subjected to a lot of physical stress and damage and repair is continuous, it is possible that damaged brain cells or osteocytes get replaced with new ones. Need to read more about this, though.