einstein

pacifist sentiments, he never expressed any desire or made any requests to enlist in the endeavor.
He was, however, offered a bit part that December. Vannevar Bush, the director of the Office of Scientific Research and Development, which
oversaw the Manhattan Project, contacted Einstein through the man who had succeeded Flexner as the head of the Institute for Advanced Study in
Princeton, Frank Aydelotte, and asked for his help on a problem involving the separation of isotopes that shared chemical traits. Einstein was
happy to comply. Drawing on his old expertise in osmosis and diffusion, he worked on a process of gaseous diffusion in which uranium was
converted into a gas and forced through filters. To preserve secrecy, he was not even allowed to have Helen Dukas or anyone else type up his
work, so he sent it back in his careful handwriting.
“Einstein was very much interested in your problem, has worked on it for a couple of days and produced the solution, which I enclose,” Aydelotte
wrote Bush. “Einstein asks me to say that if there are other angles of the problem that you want him to develop or if you wish any parts of this
amplified, you need only let him know and he will do anything in his power. I very much hope that you will make use of him in any way that occurs to
you, because I know how deep is his satisfaction at doing anything which might be useful in the national effort.” As an afterthought, Aydelotte added,
“I hope you can read his handwriting.” 27
The scientists who received Einstein’s paper were impressed, and they discussed it with Vannevar Bush. But in order for Einstein to be more
useful, they said, he should be given more information about how the isotope separation fit in with other parts of the bomb-making challenge.
Bush refused. He knew that Einstein would have trouble getting a security clearance. “I do not feel that I ought to take him into confidence on the
subject to the extent of showing just where this thing fits into the defense picture,” Bush wrote Aydelotte. “I wish very much that I could place the
whole thing before him and take him fully into confidence, but this is utterly impossible in view of the attitude of people here in Washington who have
studied his whole history.” 28
Later, during the war, Einstein helped with less secret matters. A Navy lieutenant came to visit him at the Institute to enlist him in analyzing
ordnance capabilities. He was enthusiastic. As Aydelotte noted, he had felt neglected since his brief flurry of work on uranium isotopes. Among the
issues Einstein explored, as part of a $25-per-day consulting arrangement, were ways to shape the placement of sea mines in Japanese harbors,
and his friend the physicist George Gamow got to come pick his brain on a variety of topics. “I am in the Navy, but not required to get a Navy
haircut,” Einstein joked to colleagues, who probably had trouble picturing him with a crew cut. 29
Einstein also helped the war effort by donating a manuscript of his special relativity paper to be auctioned off for a War Bond drive. It was not the
original version; he had thrown that away back when it was published in 1905, not knowing it would ever be worth millions. To re-create the
manuscript, he had Helen Dukas read the paper to him aloud as he copied down the words. “Did I really say it that way?” he griped at one point.
When Dukas assured him that he had, Einstein lamented, “I could have put it much more simply.” When he heard that the manuscript, along with
one other, had sold for $11.5 million, he declared that “economists will have to revise their theories of value.” 30
Atomic Fears
The physicist Otto Stern, who had been one of Einstein’s friends since their days together in Prague, had been secretly working on the
Manhattan Project, mainly in Chicago, and had a good sense by the end of 1944 that it would be successful. That December, he made a visit to
Princeton. What Einstein heard upset him. Whether or not the bomb was used in the war, it would change the nature of both war and peace forever.
The policymakers weren’t thinking about that, he and Stern agreed, and they must be encouraged to do so before it was too late.
So Einstein decided to write to Niels Bohr. They had sparred over quantum mechanics, but Einstein trusted his judgment on more earthly issues.
Einstein was one of the few people to know that Bohr, who was half Jewish, was secretly in the United States. When the Nazis overran Denmark, he
had made a daring escape by sailing with his son in a small boat to Sweden. From there he had been flown to Britain, given a fake passport with
the name Nicholas Baker, then sent to America to join the Manhattan Project at Los Alamos.
Einstein wrote to Bohr, using his real name, in care of Denmark’s embassy in Washington, and somehow the letter got to him. In it Einstein
described his worrisome talk with Stern about the dearth of thinking about how to control atomic weapons in the future. “The politicians do not
appreciate the possibilities and consequently do not know the extent of the menace,” Einstein wrote. Once again, he made his argument that it
would take an empowered world government to prevent an arms race once the age of atomic weaponry arrived. “Scientists who know how to get a
hearing with political leaders,” Einstein urged, “should bring pressure on the political leaders in their countries in order to bring about an
internationalization of military power.” 31
Thus began what would be the political mission that would dominate the remaining decade of Einstein’s life. Since his days as a teenager in
Germany, he had been repulsed by nationalism, and he had long argued that the best way to prevent wars was to create a world authority that had
the right to resolve disputes and the military power to impose its resolutions. Now, with the impending advent of a weapon so awesome that it could
transform both war and peace, Einstein viewed this approach as no longer an ideal but a necessity.
Bohr was unnerved by Einstein’s letter, but not for the reason Einstein would have hoped. The Dane shared his desire for the internationalization
of atomic weaponry, and he had advocated that approach in meetings with Churchill, and then with Roosevelt, earlier in the year. But instead of
persuading them, he had prompted the two leaders to issue a joint order to their intelligence agencies saying that “enquiries should be made
regarding the activities of Professor Bohr and steps taken to ensure that he is responsible for no leakage of information, particularly to the
Russians.” 32
So upon receiving Einstein’s letter, Bohr hurried to Princeton. He wanted to protect his friend by warning him to be circumspect, and he also
hoped to repair his own reputation by reporting to government officials on what Einstein said.
During their private talk at the Mercer Street house, Bohr told Einstein that there would be “the most deplorable consequences” if anyone who
knew about the development of the bomb shared that information. Responsible statesmen in Washington and London, Bohr assured him, were
aware of the threat caused by the bomb as well as “the unique opportunity for furthering a harmonious relationship between nations.”
Einstein was persuaded. He promised that he would refrain from sharing any information he had surmised and would urge his friends not do
anything to complicate American or British foreign policy. And he immediately set out to make good on his word by writing a letter to Stern that was,
for Einstein, remarkable in its circumspection. “I have the impression that one must strive seriously to be responsible, that one does best not to
speak about the matter for the time being, and that it would in no way help, at the present moment, to bring it to public notice,” he said. He was
careful not to reveal anything, even that he had met with Bohr. “It is difficult for me to speak in such a nebulous way, but for the moment I cannot do
anything else.” 33
Einstein’s only intervention before the end of the war was prompted again by Szilárd, who came to visit in March 1945 and expressed anxiety
about how the bomb might be used. It was clear that Germany, now weeks away from defeat, was not making a bomb. So why should the