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| Hiroshima Peace Dome |
On August 6, 1945, 80 years ago today, a United States B-29 dropped an atomic bomb on Hiroshima, immediately killing about 66,000 Japanese, mostly civilians, with the long-term death toll approximately 140,000.
Sixteen hours after the atomic bombing of Hiroshima, Japan, United States President Harry Truman spoke to the American people. Truman began his speech by blaming the Japanese for starting the war and ended up by calling for the peaceful use of atomic power, his theme was the power of science. Or, as he described it, “the power of the laboratories.”
By focusing on science’s power, Truman linked the past, the present, and, in his last thought, the future. This approach focused his theme to the bigger picture. Out of the cataclysm, to draw hope that atomic research could establish international security and help the world look for peaceful uses of atomic energy. Will humanity, however, be wise enough to advance in science to use its new knowledge wisely? That was Truman’s wish, and the answer remains unknown. No doubt, that is why Truman emphasized, not the impending victory, but the accomplishments of the human mind:
sacrifices of fighting men and women. World War II’s cataclysmic end, however, was an accomplishment of the human mind. Truman explained:
Truman’s speech does, also, teach us an even more general lesson. Hiroshima and its population were destroyed, and World War II ended, because the Allied powers committed themselves to scientific research. Now, the world already has far too many superweapons. The larger lesson, however, is the terrific power of science. The pacifist scientist Albert Einstein began his research, not by looking for a bomb, but by trying to understand the nature of matter. Pure, basic research. As we look to the future that Truman envisioned, lets us recognize the “power of the laboratories.”
Sixteen hours after the atomic bombing of Hiroshima, Japan, United States President Harry Truman spoke to the American people. Truman began his speech by blaming the Japanese for starting the war and ended up by calling for the peaceful use of atomic power, his theme was the power of science. Or, as he described it, “the power of the laboratories.”
By focusing on science’s power, Truman linked the past, the present, and, in his last thought, the future. This approach focused his theme to the bigger picture. Out of the cataclysm, to draw hope that atomic research could establish international security and help the world look for peaceful uses of atomic energy. Will humanity, however, be wise enough to advance in science to use its new knowledge wisely? That was Truman’s wish, and the answer remains unknown. No doubt, that is why Truman emphasized, not the impending victory, but the accomplishments of the human mind:
“What has been done is the greatest achievement of organized science in history.”In his speech, Truman called the atomic bomb:
“A harnessing of the basic power of the universe. The force from which the sun draws its power has been loosed against those who brought war to the Far East.”Truman’s comment highlighted that World War II had become a technological war. Death had rained from the air across the continents. New types of explosives, tanks, electronics, torpedoes, and aircraft joined in the struggle for world supremacy. A war that had begun with horse-drawn logistics ended with guided missiles, jet airplanes, radar-controlled gunfire—and splitting the atom. Truman assured the nation, and the world, that:
“What has been done is the greatest achievement of organized science in history.”Thus, Truman highlighted science’s power:
“The battle of the laboratories held fateful risks for us as well as the battles of the air, land and sea, and we have now won the battle of the laboratories as we have won the other battles.” [italics added]Modern science had, in general, become a massive, international enterprise, and, as Truman explained, it was international scientific cooperation that brought atomic warfare to Japan:
“Beginning in 1940, before Pearl Harbor, scientific knowledge useful in war was pooled between the United States and Great Britain, and many priceless helps to our victories have come from that arrangement. Under that general policy the research on the atomic bomb was begun. With American and British scientists working together we entered the race of discovery against the Germans.”At no point in his life would Harry Truman, a combat veteran of World War I, underestimate the
.jpg "Harry Truman") |
| Harry Truman |
sacrifices of fighting men and women. World War II’s cataclysmic end, however, was an accomplishment of the human mind. Truman explained:
“But the greatest marvel is not the size of the enterprise, its secrecy, nor its cost, but the achievement of scientific brains in putting together infinitely complex pieces of knowledge held by many men in different fields of science into a workable plan.”As he neared his conclusion, Truman acknowledged the need to examine “possible methods of protecting us and the rest of the world from the danger of sudden destruction.”
Truman’s speech does, also, teach us an even more general lesson. Hiroshima and its population were destroyed, and World War II ended, because the Allied powers committed themselves to scientific research. Now, the world already has far too many superweapons. The larger lesson, however, is the terrific power of science. The pacifist scientist Albert Einstein began his research, not by looking for a bomb, but by trying to understand the nature of matter. Pure, basic research. As we look to the future that Truman envisioned, lets us recognize the “power of the laboratories.”
J. Robert Oppenheim himself was reported to say, “The physicists have known sin.” Scientists of his era, however, also gave us vaccines, antibiotics, treatments for heart disease, safer automobiles, moon rockets, and transistors. My own life was recently saved by a spectacularly complex medical invention. Government funding financed most of those endeavors. Yet, to my horror, as the Donald Trump administration in 2025 suppresses lifesaving scientific research for short-sighted political reasons, we need to reflect long and hard about what science has done for the world, both for good and ill, and what it can do for us – or against us – in the future. Are we wise enough to make the right choices?
Historians will argue forever as to whether the atomic bombing of Japan was justified. I have my doubts, although I can see both perspectives. There is, however, no turning back the clock. We should never underestimate how science, knowledge, and investigation shape the world.
by William D. Harpine
Copyright © 2025 by William D. Harpine
Image of Harry Truman, US government portrait, public domain, via Wikimedia Commons
Image of the Hiroshima Dome, by DXR, Creative Commons license, via Wikimedia Commons
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