https://www.wsj.com/articles/book-review-through-the-cloud-hopeful-11558734296

At age 40, Albert Einstein was not in a rush to get married a second time. He was seven years into a relationship with his cousin Elsa, one that had begun while he was married to his long-suffering first wife, Mileva. He finally relented, perhaps giving into pressure from Elsa’s family, and tied the knot in Berlin on June 2, 1919. It’s what happened four days before, thousands of miles away, that not only ensured Einstein’s immortality but also marked a turning point for science. On May 29, two far-flung British expeditions...