I believe that it was about the acceptance of Quantum Mechanics.
Examples include that Edward Cope never accepted Darwin's theory of evolution (even though the fossils that he found were good evidence for it), Albert Einstein never accepted QM (even though his Nobel was for one of the key discoveries on the way to QM), and Fred Hoyle never accepted the Big Bang (even though he coined the phrase).
I went and found an interesting article confirming this. When a star researcher in a field dies, the result is an increase in people entering the field and exploring the ideas.
I believe that it was about the acceptance of Quantum Mechanics.
Examples include that Edward Cope never accepted Darwin's theory of evolution (even though the fossils that he found were good evidence for it), Albert Einstein never accepted QM (even though his Nobel was for one of the key discoveries on the way to QM), and Fred Hoyle never accepted the Big Bang (even though he coined the phrase).