Golly, its not so bad as "turtles all the way down".
This message only reached you because we have a firm grasp on one aspect of quantum mechanics. "Quantum Tunneling" is basic to the successful operation of flash memory, solid-state drives, and other electronics that have electron "channels" down in the 20nm range. So, the internet depends on it.
Closer to home, bees navigate using the "celestial polarization pattern" in the sky, and the process of light (UV or visible), reflecting, scattering, refracting, and polarization is only fully understood when viewed as a quantum effect. The very obscure field of quantum electrodynamics addresses how light interacts with matter, and one of the easiest ways that anyone can create a "confounding example" of "quantum physics" is with 3 pieces of polarized film.
Two polarizers at 90 degrees to each other will block 100% the light from a light beam. But if a third polarizer is sandwiched between those two polarizers at a 45 degree angle, some light gets through the set of polarizers. This demonstrates the "superposition principle" of quantum mechanics, and freaks out many people, but this is how "polarization" really works.
But "quantum stuff" is only useful when one is working at the incredibly small "nano-scale". For most human activities, "quantum effects" can be safely ignored. Also, "relativistic effects" can be safely ignored in most human endeavors, so we visited the moon, and launched every space probe without any need to consider "relativity". Except GPS - GPS would not work at all if one does not account for relativity.
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