It has to be remembered that at the end of the 19th century, scientist thought they iknew how the universe worked, and that there were a few loose ends to be tied up, such as the non-smooth behaviour of the photoelectric effect and the direction of flow of the ether. However, in 1912 a swiss patent clerk wrote 3 scientific papers, two of which answered these questions by turning physics up side-down. The same could happen again, even in a field we think that we understand.
the answers to those questions, by the way were:
1) The ether has no flow as it doesn't exist.
2) The lack of smoothness in the photoelectric effect is because light travels around as packets of energy.