The answer to your question is Calcium
It’s a term that is used to determine how contagious a disease is. R-0 is used cause it helps determine how fast or slow an infection would spread.
Figuring out what causes of stress there are in our life is often very hard. When you are under pressure your body will react by making you more alert to specific elements, such as dangers. So if you are stressed, finding the cause or causes of stress (stressors) is even more difficult.
Line of scrimmage is the answer!