Quantum theory explains the behaviour
of particles and energy at extremely
small scales —
smaller than atoms that were once considered the
building block of all
matter.
In a few thousand years
of recorded history, we went from dwelling in caves and mud huts and tee - pees, not understanding the natural world around us, or the broader universe, to being able to travel through space, using reason to ferret out the hidden secrets
of how the world works, from physics to chemistry to biology, we worked out the tools and rules underpinning it all, mathematics, and now we can see objects that are almost impossibly
small, the very tiniest
building blocks of matter, (or at least we can examine them, even if you can't «see» them because you're using something other than your eyes and photons to view them) to the very farthest objects, the planets circling other, distant stars, that are in their own way, too
small to see from here, like the atoms and parts
of atoms themselves, detected indirectly, but indisputably THERE.