I studied molecular biology 15 years ago. Recently I realized that I started to forget more and more about it, like how the rooms looked, names of professors, (

I studied molecular biology 15 years ago. Recently I realized that I started to forget more and more about it, like how the rooms looked, names of professors, (obviously) a lot of the material I learned, etc. But I can't forget about our professor of Genetics: he was suffering from lung cancer, so when he talked about cancer, it had a tremendous impact. He also used to be a smoker and was quite outspoken against that too.