THE RECORD
What changed
Einstein's relativity and work by Planck, Bohr, Heisenberg, Schrödinger and others formed new physics.
EVIDENCE
What remains
Papers, letters, observations and spectroscopy preserve prediction and debate.
WHY IT MATTERS
Why it matters
They underlie technologies from GPS to semiconductors, lasers and nuclear physics.
OPEN QUESTION
Where interpretation begins
They were not completed by isolated genius, and interpretations of quantum theory still differ.