My mother died from pancreatic cancer 5 months ago when she was 55 years old, 9 months after she started noticing pain and doctors started investigating it.
The worst thing is that she never worked in any hazardous environments, never smoked, never drank alcohol, avoided fried cuisine, avoided GMO-food, she was always eating as much as possible from her own garden, did not use any chemicals, she wasn't obese, she didn't have diabetes, she didn't have any problems with pancreas or any other significant health issues. None of her close relatives had cancer. For the last 30 years she lived in a very clean region that doesn't have any industrial factories/manufactures.
The only possible hazard she had - she worked for 15 years near busy road, where there was a lot of diesel/gas engine exhaust, but I doubt this is related to her pancreatic cancer, as I found normally this affects lungs/respiratory paths. Maybe she was exposed to some agricultural chemicals in her childhood, because she was living near agricultural fields in the Soviet Union, but I doubt she was significantly exposed to it.
I even joked with her that she was living probably the most cancer-cautious life, and still got cancer. So the worst thing for her is that nobody could tell what she did incorrectly to get this illness. It felt very unfair for her.
C++ is relatively easy to read.
The only troubles I had is reading STL's sources because of all _ and __ prefixes, and understanding template errors from compiler, but that will soon be fixed with concepts.