That there is such a thing as deterministic chaos (aka the butterfly effect), ie. infinitesimal perturbations can quickly produce macroscopic changes, and all t

That there is such a thing as deterministic chaos (aka the butterfly effect), ie. infinitesimal perturbations can quickly produce macroscopic changes, and all the philosophical implications that result from it. That despite the apparent complexity of the weather many atmospheric phenomena can be explained from first principles with pen and paper calculations. That the existence of elementary particles can be derived from simple symmetry considerations (That one blows my mind every time.) That when we look out into the universe we see elements roughly in the same proportions as they appear on earth. (We are all made out of star dust!)