When you hit about 65% of your heart’s maximum output, your leg muscles are working at the upper limit of their low aerobic zone. (“Aerobic” means your muscles have all the oxygen they need.) This is as fast as you can go burning fat. It’s like diesel: great mileage but low torque.
You can go all day, but you can’t go fast.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.