At Easter I'm going to Berlin as an Academy man without any obligations, rather like a living mummy, Albert Einstein wrote in the fall of 1913. The most important physicist of the 20th century worked for nearly two decades in the Prussian metropolis. These twenty years represent the pinnacle of his scientific and social recognition – however they were also a period of increasing political and anti-Semitic attacks. So what were the personal and scientific relationships that bonded Einstein so...
