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Scientific American

Former deputy surgeon general Erica Schwartz nominated as new CDC chief NASA Artemis II astronauts say thank you to the world Congress grills RFK, Jr., about vaccines and cuts to health budget How the Grand Canyon formed is a surprisingly messy story. Here's the latest clue How far from humanity were the astronauts of Artemis II? The answer will surprise you Effect of antiamyloid Alzheimer’s drugs ‘absent or trivial,’ Cochrane review finds The Trump administration is looking to experts to weigh in on peptides When a naked mole rat queen dies, that usually means war—but not for this colony NASA needs nuclear power for its moon base. Here’s the White House plan to get it Why do older people have fewer seasonal allergies? 250-million-year-old fossil proves mammal ancestors laid eggs A face-swapping illusion can unlock childhood memories 30 years of Pokémon—how the Japanese franchise mirrors real-world science Sperm whales may make their own vowel sounds, similar to human language Colombia will euthanize Pablo Escobar’s invasive ‘cocaine hippos’ NASA’s Artemis III will pit SpaceX against Blue Origin The East Coast could see blazing hot temperatures this week. Here’s why Scientists just discovered 5.6 million bees under a New York State cemetery The real science of Pokémon How chemists engineer the signature smells of luxury perfumes How two mathematicians solved a cryptography mystery The engineering marvels hidden inside six-figure watches Expensive versus affordable binoculars—what’s the difference? How physicists found a new type of magnet hiding in plain sight A hot pair of supplements, creatine and methylene blue dye, may not work together Unlikely paths to discovery The baffling ecological disaster that's killing America’s freshwater mussels Poem: ‘How I Became a Spitfire Pilot during My Cataract Operation’ DARPA built an AI to fact-check enemy weapons claims Mathematicians created an ‘impossible’ shape that shouldn’t exist How cosmic rays are helping mining companies find critical minerals underground New evidence links heart disease to inflammation—and drugs can stop it An asteroid extinguished all the dinosaurs except for birds. Here’s why Math Puzzle: A disassembly job May 2026: Science History from 50, 100 and 150 Years Ago Readers respond to the January 2026 issue How to build a space hotel The humble ham sandwich inspired a math theorem for sharing food fairly Imperiled ‘cloud jaguar’ spotted in Honduran mountains for the first time in a decade Person functionally cured of HIV after bone marrow transplant from sibling Dream Chaser space plane faces uncertain future in NASA’s push for the moon Bizarre ‘compleximers’ break the rules of both glass and plastic This method to reverse cellular aging is about to be tested in humans The Artemis II mission worked—but should we really keep returning to the moon? How DNA forensics is transforming studies of ancient manuscripts Beetle larvae mimic flower scents to attract bee hosts See NASA’s Artemis II mission around the moon in 12 stunning photos New study shows how the brain weighs evidence to make decisions What NASA’s Artemis II tells us about the ‘overview effect,’ moon joy and awe New metal with triple copper’s heat conduction challenges fundamental physics NASA’s Artemis II reveals why humans still love the moon NASA’s Artemis II moon mission splashes down The Expanse authors James S. A. Corey explore alien war in new book The Faith of Beasts New particle mass measurement deepens quantum mystery NASA’s Artemis II crew returns today—here’s what to know ahead of splashdown Why bombing Iran’s nuclear power plant could cause an environmental disaster Mysterious heart neurons maintain blood pressure to prevent fainting NASA’s Dragonfly mission will send a nuclear-powered flying drone to Titan This sci‑fi twist on Moby-Dick will blow your mind Medieval aurora poetry provided clues to historic solar storms White House budget puts 54 NASA science missions on the chopping block NASA’s Artemis II moon mission is on track for Friday splashdown Timeline of the Artemis II moon mission’s return to Earth Why can’t humans regenerate limbs? New research offers a clue How the wildlife trade boosts the chance of a disease jumping from animals to humans Two hundred chimpanzees are embroiled in a ‘civil war’ NASA’s Artemis II moon mission preps for its last full day in space How China could still win the new moon race Lyme disease is spreading, but a new vaccine could curb infections No, Shroud of Turin DNA analysis doesn't show relic's origins, experts say What’s the deal with the Artemis II music? The crew finally gave us some answers The world’s deepest sensors will detect earthquakes around the world from far below Antarctica Why Artemis II’s reentry may be the moon mission’s greatest challenge yet NASA’s Artemis II moon mission is focusing on its return to Earth What is the quantum ‘Ghost Murmur’ purportedly used in Iran? Scientists question CIA’s claim of long-range heartbeat detection How well GLP-1 weight loss drugs work may depend on your genetics NASA’s Artemis moon missions are a game changer for astronomy Tracking Artemis II—after its historic lunar flyby, NASA’s moon mission heads home NASA’s Artemis program has sparked a race to land U.S. rovers on the moon Do people see robots as having race? New studies clash as humanoids enter the real world Health experts warn of rising measles cases in undervaccinated communities In a first, Artemis II moon mission astronauts make ‘ship to ship’ call to ISS The mathematically correct way to slice a pizza See NASA’s Artemis II mission’s first incredible photos of the moon, Earth and a total solar eclipse In an echo of Apollo 8, NASA’s Artemis II astronauts witness stunning ‘Earthrise’ and ‘Earthset’ NASA’s Artemis II astronauts celebrate epic lunar flyby with stunning new images NASA’s Artemis era may finally solve three major moon mysteries NASA’s Artemis II ‘free return’ trajectory lets gravity do the driving Trump speaks with NASA's Artemis II astronauts after historic moon flyby NASA’s Artemis II crew experience total solar eclipse from space NASA’s Artemis II moon mission reaches greatest distance from Earth NASA’s Artemis II astronauts break Apollo’s distance record Watch live—NASA’s Artemis II’s moon flyby is underway Bypass the Strait of Hormuz with nuclear explosives? The U.S. studied that option in the 1960s NASA’s Artemis II mission is about to pass behind the moon NASA’s Artemis II, endangered species and oil, low western U.S. snowpack Where is Artemis II? NASA astronauts near the moon for first time in more than 50 years NASA’s Artemis II laser communications system is beaming 4K video from the moon NASA’s Artemis II moon mission is gearing up for its lunar flyby What will NASA’s Artemis II astronauts see on the moon?
July/August 2026: Science history from 50, 100 and 150 years ago
Jeanna Bryner · 2026-06-16 · via Scientific American

Natural fission reactor uncovered; geometry of soap bubbles

Line drawing diagram of a woman wearing a late 1800s outfit demonstrating the invention of an umbrella supporter with the use of rods and elastic straps. Image from Scientific American archive, Vol. 35, No. 3; July 15, 1876.

1876, Umbrella Supporter: "Here is a view of a new parasol and umbrella supporter invented by Eliza M. Arnold of Houston, Texas. The contraption is fitted to its wearer with rods and elastic straps."

Scientific American, Vol. 35, No. 3; July 15, 1876

1976

Natural Fission Reactor

“In an open-pit uranium mine in the southeastern part of the Gabon Republic, near the Equator on the coast of West Africa, are the dormant remains of a natural fission reactor. Within a rich vein of uranium ore the natural reactor once ‘went critical,’ consumed a portion of its fuel and then shut down, all in Precambrian times.


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“The history of the natural reactor is an extraordinary sequence of seemingly improbable events. First, uranium from an entire watershed accumulated in concentrated local deposits, including one at a place now called Oklo. Then the conditions necessary to sustain the fission chain reaction were established. After the reactor had shut down, the evidence of its activity was preserved virtually undisturbed through the succeeding ages of geological activity. Finally, the discovery of the reactor involved an investigative tour de force worthy of the best sleuths in detective fiction.”

Geometry of Soap Bubbles

“Soap bubbles and soap films evoke a special fascination. Their shifting iridescence, their response to a puff of air, their fragility—all contribute to their charm. More captivating still is the exquisite perfection of their geometry, the absolute smoothness of their forms. What are the principles that enable soap bubbles and soap films to exist in certain geometric configurations and not in others? What are the possible shapes they can assume?

“Recently we have been able to show that three basic rules governing the geometry of soap bubbles and soap films are a mathematical consequence of a simple area-minimizing principle.”

1926

How to Get Along with People

“This is the age of diplomacy. The polished sword has been supplanted by the polished word. The terrifying growls of anger have yielded place to the soothing words of tact. A careful study of the qualities of the so-called successful man will reveal in nine cases out of 10 that his success depends not on the deep and profound something which puzzles the brains of the average man, but on the simple and more superficial something which pleases the understanding of the common folk. It is that congenial something which I have defined as ‘social intelligence,’ or the ability to get along with people; while the profound something, I define as ‘abstract intelligence,’ or the ability to deal with ideas.”

Our Point of View

“‘Garabed’ is a new word which bids fair to enter the language. A definition of it might be ‘scientific hokum in support of which political pressure is brought to bear.’ Garabed is the name Garabed T. K. Giragossian gives to his alleged ‘free energy generator’ or illimitable source of power. Eight years ago he succeeded in having Congress pass a measure agreeing to give him extraordinary privileges if he could prove his claims. For Congress to lend an ear to Giragossian’s fantastic scheme establishes a dangerous precedent. It opens the door to any charlatan who seeks to ignore the orderly process of government.”

1876

Caution about Coca Leaf

“Sir Robert Christison showed recently, before the Edinburgh Botanical Society, that diversity of opinion existed in regard to the effects of coca upon those who chew it; for, while most of them considered that it possessed wonderful powers of sustaining strength under prolonged fatigue without food, some thought its use pernicious and dangerous, others, not only innocuous, but beneficial to health.

“Sir Robert gave an account of some experiments made upon some of his students and himself, in which he had found that it was both a preventive of fatigue and a restorative of strength after severe bodily exertion, and that it had no reactionary effect upon the system. In regard to the use of coca as a medicine, he advised no one to try it until something more was known about it, or, at least, not make use of it without consulting a physician.”

Three thumbnail size images of Scientific American's July 1976, 1926 and 1876 cover.

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