Carl Schwarzschild

Fritz Haber and Albert Einstein standing together in Berlin in 1914

Fritz Haber and Albert Einstein: Friendship in Contradiction

Two of the greatest scientists of the 20th century were close friends, even though one was a pacifist and opposed to nationalism while the other put science at the service of chemical warfare and the German Empire.
Karl Schwarzschild: The scientist who solved Einstein's equations from the front

Karl Schwarzschild: The scientist who solved Einstein's equations from the front

A few weeks after the publication of the general theory of relativity, German-Jewish astronomer Karl Schwarzschild found the first exact solution to Einstein's equations. The solution, sent from the front lines of World War I, later laid the foundation for the mathematical description of
Black hole simulation. Quantum entanglement and black holes, two seemingly unrelated phenomena, may lead physicists to the long awaited unification: the unification of general relativity and quantum mechanics. Image: Ute Kraus / Wikimedia.

A brief history of black holes