Compared to the Bohr atom model we changed our thinking of particles to energy packets with quantum features. I am capable of taking the most simple path to understanding and do not even speak the exquisite language of mathematics. I more or less take a geometric approach.

As an athiest I assume we get only one go around so I have reinvented myself 4 or 5 times once I begin to feel a same familiarity or need to escape chaos. My current energy level has been the longest and somewhat laziest period. I think this is common to most people and that a singular focus for a lifetime is the rare example.