This one of the most brilliant speeches of Walter White in Breaking Bad :
Chemistry is the study of matter, but I prefer to see it as the study of change.
Now, just think about this.
Electrons, they change their energy levels.
Molecules change their bonds.
Elements, they combine and change into compounds.
Well that’s… That’s all of life, right?
It’s the constant, it’s the cycle… It’s solution, dissolution, just over and over and over.
It’s growth, then decay, then transformation.
It is fascinating, really.
So, in conclusion: Life is chemistry, and chemistry and life are constantly changing.