John Robert Oppenheimer

Oppenheimer movie poster. By UNIVERSAL - Instagram SERTTOV, fair use poster, https://he.wikipedia.org/w/index.php?curid=2220162

The Soviets vigorously courted Oppenheimer but he refused to spy for them

The Soviets did manage to plant spies who provided the secrets of the atomic bomb to the Kremlin and allowed them to detonate the first bomb in August 1949, it was a copy of the bomb built in Los Alamos and dropped by the Americans
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