| OPPENHEIMER | Werner Heisenberg and Harry S Truman are represented in this 2023 film |
| INIT | Ulysses S. Grant and Harry S. Truman both had one: Abbr. |
| UMLAUT | Diacritical mark resembling a dieresis, both of which are represented in this puzzle |
| WERNERS | Nobelists Heisenberg and Forssmann |
| UNCERTAINTYPRINCIPLE | Enunciated by Werner Heisenberg in 1927, what places an absolute, theoretical limit on the combined |
| LEO | Adam Sandler voices the titular lizard in this 2023 musical comedy (3) |
| NAPOLEON | Joaquin Phoenix plays the title role in this 2023 historical epic (8) |
| UNCERTAINFUTURE | "Werner Heisenberg, you face an ___" |
| GARYOLDMAN | Actor who played President Harry S. Truman in the 2023 film Oppenheimer (4,6) |
| LYING | Harry S Truman described Richard Nixon as, 'One of the few in the history of this country to run for high office talking out of both sides of his mouth at the same time and ... out of both side' |
| CALAIS | French town whose burghers are represented in a Rodin sculpture in London's Victoria Tower Gardens (6) |
| NFL | What Los Angeles and New York are represented in twice: Abbr. |
| DEANACHESON | US Secretary of State in the administration of President Harry S Truman from 1949 to 1953 |
| NSA | Intelligence organisation formed by Harry S Truman in 1952 |
| TREFOIL | A plant such as clover whose three-lobed leaves are represented in architectural tracery, heraldry or used in the Girlguiding logo |
| POTSDAM | "The Russians are liars - you can't trust them" (Harry S Truman, talking about the 1945 ____ conference) |
| BUCK | The _ stops here; a phrase US president Harry S Truman loved (4) |
| ACHESON | Dean --, Secretary of State under President Harry S. Truman (7) |
| MICHAELONTKEAN | Slap Shot actor who played Sheriff Harry S. Truman on Twin Peaks: 2 wds. |
| TANTRUMS | Harry S Truman securing time for pets (8) |
