The meanwhile known natural constants are physically measurable quantities that are crucial for the existence of our universe. What truly lies behind them, what connects them, and why they are the way they are, remains completely unknown. But for sure one can say, if they weren't the way they are, our universe wouldn't exist at all. There would be neither atoms, nor anything we call "solid matter", and therefore neither galaxies, planets, nor planetary systems—and, of course, no living beings.