If bilirubin(bile) from liver rises from 1.2 to 2mg/dl it will result in jaundice. That is difference of only 0.8mg is enough.
Faith
Because you gotta have faith. Without it life is impossible.
Power of Heart
After reading the topic you would be thinking about some kind of love story or something of that line.
But I mean it literally:
Heart pumps 6000 liters blood daily without any rest. Yes literally heart is very strong.