Consider another miracle of Hashem’s design.
The atmosphere serves, among other things, as a shield that prevents space debris from falling and harming earth.
It also allows us to breathe. The atmosphere around us is made up of two main ingredients—nitrogen and oxygen—whose mixture is always the same, whether at the highest mountaintops or in the deepest caves. The perfect balance is 79 percent nitrogen and 21 percent oxygen. You might ask, “Why is it this way?” Is there some particular reason for it? Is it important that we have this exact mixture of nitrogen and oxygen?” Yes, I can assure you it is most important. If the nitrogen were increased, our life processes would slow down and we would die. If the oxygen were measurably increased, our life processes would be rapidly increased. Our pulse rate would just run away and soon we would wear out and die. But Hashem made it just right.
Suppose, for example, it was two-thirds nitrogen and one-third oxygen. If that proportion prevailed, and an electrical reaction caused the elements to combine, do you realize that the whole world would be turned into laughing maniacs? Everybody would be laughing because that would produce the laughing gas, N2O, the same kind dentists sometimes use when extracting teeth. Or suppose it was divided half and half. That would produce nitric oxide, which is quickly fatal to all forms of life.
This world would become truly chaotic if this atmospheric mixture slipped out of control for just a single instant. We would see one of the most tremendous of all explosions, because nitrogen is the basic component of gunpowder; and oxygen, of course, makes for rapid combustion. It would be “Goodbye, world!”