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A dark legacy’s silver lining Manhattan Project scientists detonated the first nuclear bomb in mid-July 1945 in the desert of New Mexico. Nuclear bomb explosions liberated millions of neutrons, creating carbon-14 that quickly joined with oxygen to make heavy carbon dioxide.

Less than a month later, United States warplanes dropped bombs on Hiroshima and Nagasaki, Japan. Plants absorbed this, and it made its way into our food chain, our bodies and our teeth. The carbon from your food sources becomes part of you,” says Buchholz.

Investigators can then refine the search with other techniques, such as DNA matching. By the time the treaty was signed, nuclear testing had doubled the amount of radioactive carbon-14 — a heavier form of carbon atoms than the more stable carbon-12 — in the atmosphere.

The method, Buchholz believes, could help crack thousands of cold cases — if more investigators knew it existed. Carbon-14 normally is created in trace amounts by cosmic rays walloping nitrogen atoms high in the atmosphere.

The silhouette of an expanding mushroom cloud came to embody our fear of annihilation by incineration.

Little did we know that the bomb didn’t just scar our psyches. Hundreds of atmospheric bomb tests before 1963 doubled the amount of radioactive carbon in the air.

Two larger-than-life blow-up figures — an emperor penguin and Edvard Munch’s screamer — stand guard over it in a room the size of a basketball court.

When giving a tour of the noisy spectrometer, Buchholz sheds his measured tone and becomes animated.

It’s now a forensic tool, not just a research instrument; it can reveal when the tooth’s owner was born.

The squee-CHUNK, squee-CHUNK of the vacuum pump forces everyone in the cavernous room to yell.

Physicist Bruce Buchholz peers at an aluminum container the size of a black bean.

The clue lies inside the tooth, in an unsettling imprint made by atomic bombs.

In the decades after World War II, generations of schoolchildren practiced “duck and cover” drills, scrambling under their desks against the grim possibility of nuclear attack.

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