Here’s a fact that should bother you more than it does: the Sun, by the rules of classical physics, shouldn’t work.
To fuse, two protons in the Sun’s core have to touch. But protons are both positively charged, so they ferociously repel each other — and the core, at a mere ~15 million °C, simply doesn’t pack enough thermal energy to ram them together. Run the classical numbers and the Sun stays dark.
What saves us is quantum tunnelling. A proton isn’t a tiny ball at one location; it’s a smear of probability. Every so often that smear leaks through the energy barrier it could never climb over — and the two protons fuse. Each individual proton might wait billions of years for its turn, but the Sun has so many that the trickle adds up to the steady furnace warming your skin right now.
Every sunbeam you’ve ever felt is the output of a loophole in the laws of physics.