Lise Meitnerthe ObservatoryINTJ

On 13 July 1938, Lise Meitner left Berlin for the Dutch border carrying a diamond ring that was not hers. She was 59, an Austrian physicist of Jewish family, and she was escaping Nazi Germany.

The ring had belonged to the mother of Otto Hahn, the chemist she had worked beside for some thirty years. She spent her last night in Berlin at his home, and he gave her the ring in case of emergency. There were no speeches. Something of value was quietly handed over, in case the worst happened.

Hahn helped her get out. That matters, because of what came later.

She had stayed far too long. Hitler came to power in 1933, when she was 54, and she remained in Berlin for five more years out of loyalty to her institute and the work she had built there.

Observatories are often slow to leave. Their loyalty runs to structures: the laboratory, the half-finished experiment, the team that finally works. Meitner could see deep inside the atom. She was slower to see the danger in the street outside.

In exile, the work went on. That December, Hahn wrote to her in Sweden with results he could not explain. Over Christmas, on a walk through the snow with her nephew Otto Frisch, she worked out what they meant: the uranium nucleus had split in two. The physicist who explained fission was a refugee, shut out of the laboratory where it was found. Observatories will recognize the method: one other mind, a long walk, and a problem nobody else could see yet.

In November 1945, the Nobel Prize in Chemistry for 1944 went to Hahn alone. In the years after, he made her part in the work smaller than it had been.

She had already turned her judgment on him. In June 1945 she wrote to him about what the German scientists had done. “You all worked for Nazi Germany,” she told him. The letter never reached him, and she never took the verdict back.

Then she turned the same judgment on herself.

There is no self-pity in that sentence, and no excuse. She does not say she was deceived, or that others were worse. The subject is her. It is the same exact reasoning she had brought to the nucleus, aimed where it hurt most.

Many people would have made a clean break with Hahn. He had worked on in Germany, taken the prize alone and shrunk her share of the story. She kept him. Hahn later wrote that they remained close friends all their lives.

She died in Cambridge in October 1968, at 89. She never softened the verdict, and she never let go of the friend.