1911 was an interesting time to be a physicist. At that time, as best as anyone could figure out, the foundations of our understanding of physics seemed to be cracking. Small, annoying little differences between what classical physics predicted and what actually happened began to get bigger and bigger, and could never be explained away. These little threads were unravelling the whole tapestry of physics that had been built up since Newton.
So maybe interesting isn’t a strong enough word.