The Islam of the 18th, 19th and first half of the 20th century was a poor thing. Nobody bothered about it. Islam was that funny sort of pure system of beliefs that depressed people in the Middle East held as their religion. ↗
The revival of Islam dates from the early years of the 20th century. It was brought about by their humiliation, by their sense of how low they'd fallen compared with the West. ↗
Even before string theory, especially as physics developed in the 20th century, it turned out that the equations that really work in describing nature with the most generality and the greatest simplicity are very elegant and subtle. ↗
Louis Armstrong is quite simply the most important person in American music. He is to 20th century music (I did not say jazz) what Einstein is to physics. ↗
Just as it had taken centuries to determine the true nature of the universe, so also the search for the beginning of human life proceeded well into the 20th century. ↗