It takes just a few seconds to read a sentence. Yet if one of the body’s enzymes failed to work, it would take 1,500 years to read that same sentence. Enzymes activate cells and initiate and accelerate reactions up to 1010 (10 billion) times. In their absence, those cells that are waiting to go into action and perform many other reactions that keep you alive, even though they are unaware of each other and motionless, would start to die one by one before you even finished reading this sentence. As a result, you would die before you reached the end of this sentence....