Art Diamond – Page 20 – artdiamondblog.com

Too Little Carbon Dioxide Caused Earth to Be a Frigid Barren “Snowball” for 56 Million Years

(p. D4) Around 717 million years ago, Earth’s humid landscapes and roiling blue waters transformed into a frigid, barren world. Scientists nicknamed this stage of geological history, and others like it, Snowball Earth.

What exactly froze the planet nearly solid has been a mystery, as has how it remained that way for 56 million years. On Wednesday, a team of researchers at the University of Sydney said they have it figured out. Earth’s glaciation, they say, may have come from a global drop in carbon dioxide emissions, a result of fewer volcanoes expelling the gas into the atmosphere.

Less carbon dioxide makes it more difficult for Earth’s atmosphere to trap heat. If the depletion were extreme enough, they argued, it could have thrust the planet into its longest ice age yet.

The theory, published in the journal Geology, adds insight to the way geological processes influenced Earth’s past climate. It may also help scientists better understand trends in our current climate.

. . .

Dr. Dutkiewicz and her colleagues turned their eyes to volcanoes because of a newly available model of Earth’s shifting tectonic plates. As the continents spread apart, they studied the changing length of the mid-ocean ridge — a chain of underwater volcanoes — predicted by the model.

The team then calculated the amount of volcanic gas emissions at the beginning of, and throughout, the ice age. Their results showed a drop in atmospheric carbon dioxide sufficient to initiate and sustain a 56-million-year glaciation.

A reduction in volcanic gas emissions has been proposed as an explanation for Snowball Earth before. But according to Dr. Dutkiewicz, this is the first time researchers have proved that the mechanism was viable through modeled computations.

For the full commentary, see:

Katrina Miller. “How Earth Stayed Frozen for So Long.” The New York Times (Tuesday, February 13, 2024): D4.

(Note: ellipsis added.)

(Note: the online version of the commentary was updated February 12, 2024, and has the title “How Earth Might Have Turned Into a Snowball.”)

The paper in the journal Geology mentioned above is:

Dutkiewicz, Adriana, Andrew S. Merdith, Alan S. Collins, Ben Mather, Lauren Ilano, Sabin Zahirovic, and R. Dietmar Müller. “Duration of Sturtian “Snowball Earth” Glaciation Linked to Exceptionally Low Mid-Ocean Ridge Outgassing.” Geology 52, no. 4 (2024): 292-96.

SpaceX Embraces Fast Failures as the Best Path to Fast Fixes

(p. B1) SpaceX’s Starship spacecraft pulled off an extended flight through space on its third test mission, marking major progress for a vehicle that could one day transport astronauts to the moon and beyond.

Shortly after launching the nearly 400-foot-tall rocket Thursday [March 14, 2024], SpaceX successfully separated the booster from the spacecraft, which proceeded to fly for around an hour before it was lost while re-entering Earth’s atmosphere, according to a company livestream.

The mission advanced much farther than the company’s previous two Starship test flights. It was a milestone for a vehicle that is a centerpiece of SpaceX’s commercial ambitions, NASA’s space exploration plans, and company founder Elon Musk’s goal of one day sending humans to Mars.

. . .

(p. B4) Current and former SpaceX leaders have said the company embraces failing fast to try to rapidly identify fixes and improve. The company took 63 corrective actions to address issues that emerged during the initial launch, and an additional 17 following the second, according to the FAA.

For the full story, see:

Micah Maidenberg. “SpaceX Starship’s Third Test Mission Marks Major Progress Before Explosion.” The Wall Street Journal (Friday, March 15, 2024): B1 & B4.

(Note: ellipsis, and bracketed date, added.)

(Note: the online version of the story was updated March 14, 2024, and has the title “SpaceX’s Starship Makes Major Progress in Third Flight Test.”)

Carbon Dioxide Greens the Earth as Plants Slow Global Warming

(p. D3) For decades, scientists have been trying to figure out what all the carbon dioxide we have been putting into the atmosphere has been doing to plants. It turns out that the best place to find an answer is where no plants can survive: the icy wastes of Antarctica.

As ice forms in Antarctica, it traps air bubbles. For thousands of years, they have preserved samples of the atmosphere. The levels of one chemical in that mix reveal the global growth of plants at any point in that history.

“It’s the whole Earth — it’s every plant,” said J. Elliott Campbell of the University of California, Merced.

Analyzing the ice, Dr. Campbell and his colleagues have discovered that in the last century, plants have been growing at a rate far faster than at any other time in the last 54,000 years. Writing in the journal Nature, they report that plants are converting 31 percent more carbon dioxide into organic matter than they were before the Industrial Revolution.

. . .

Since plants depend on carbon dioxide to grow, scientists have long wondered if that extra gas might fertilize them.

. . .

In the mid-2000s, atmospheric scientists discovered a powerful new way to measure plant growth: by studying an unimaginably rare molecule called carbonyl sulfide.

Carbonyl sulfide — a molecule made of a carbon atom, a sulfur atom and an oxygen atom — is present only in a few hundred parts per trillion in the atmosphere. That is about a million times lower than the concentration of carbon dioxide. Decaying organic matter in the ocean produces carbonyl sulfide, a gas that then floats into the atmosphere.

Plants draw in carbonyl sulfide along with carbon dioxide. As soon as it enters their tissues, they destroy it. As a result, the level of carbonyl sulfide in the air drops as plants grow.

. . .

But Dr. Campbell and his colleagues found that it hasn’t increased very much. As we have been adding carbonyl sulfide to the atmosphere, plants have been pulling it out. In fact, the scientists found, they have been pulling it out at a staggering rate.

“The pace of change in photosynthesis is unprecedented in the 54,000-year record,” Dr. Campbell said. While photosynthesis increased at the end of the ice age, he said, the current rate is 136 times as fast.

With all that extra carbon dioxide going into plants, there has been less in the air to contribute to global warming. The planet has warmed nearly 2 degrees Fahrenheit since 1880, but it might be even hotter if not for the greening of the Earth.

For the full commentary, see:

Carl Zimmer. “MATTER; A Global Greening.” The New York Times (Tuesday, April 11, 2017 [sic]): D3.

(Note: ellipses added.)

(Note: the online version of the commentary has the date April 5, 2017 [sic], and has the title “MATTER; Antarctic Ice Reveals Earth’s Accelerating Plant Growth.”)

The paper in Nature mentioned above is:

Campbell, J. E., J. A. Berry, U. Seibt, S. J. Smith, S. A. Montzka, T. Launois, S. Belviso, L. Bopp, and M. Laine. “Large Historical Growth in Global Terrestrial Gross Primary Production.” Nature 544, no. 7648 (April 16, 2017 [sic]): 84-87.

Edgar Allen Poe Said Intuitive Leaps Should Be Added to Deduction and Induction as Paths to Knowledge

(p. C7) In an 1848 lecture, Edgar Allan Poe—the “Raven” guy, the progenitor of detective stories and spooky science fiction, who married his 13-year-old cousin, and died after being found insensibly drunk and wearing (somehow the most unsettling detail of all) another man’s clothes—this ink-stained wretch described a startling number of what would turn out to be prominent features of modern cosmology, including the big bang, the big crunch and the unity of space-time.

. . .

Where Poe sent audiences winging around the universe (or multiverse, another concept he seems to have anticipated), Mr. Tresch keeps to a steady course. He approaches Poe’s uncanny lecture—and its published version, the prose poem “Eureka”—not as a crazy fever dream, but as an inspired series of leaps from a firm grounding in fact.

. . .

In his lecture on the universe, Poe turned this method upside down: Here he used fiction in the service of science. He began by citing a letter, purportedly written in 2848, that mocked the primitive methods of 1848, when overconfident scientists believed that deduction and induction were the only paths to knowledge. Intuitive leaps, Poe insisted, could yield insights of their own. One such “soul-reverie” led him to argue that the universe began when “a primordial Particle” erupted outward in every direction. Everything that has happened since then is the result of the interplay of “the two Principles Proper, Attraction and Repulsion.” So far, so reasonable, by the lights of 21st-century cosmology. Still, plenty of what Poe went on to assert is either flatly wrong, ludicrously wrong, or outside the realm of cosmology properly defined, e.g., his suggestion that if there are multiple universes, each might have its own god.

“The Raven,” “The Tell-Tale Heart,” “The Pit and the Pendulum”: As far as Poe was concerned, these gloomy triumphs of his imagination—all the poems and short stories that have made him immortal—counted for less than his cosmic speculations, which he considered the pinnacle of his career. “I could accomplish nothing more since I have written Eureka,” he told his mother-in-law/aunt. So imagine his dismay when, after requesting a print run of 50,000 copies, his publisher granted him only 500, and even these didn’t sell. A year later, Poe would spend a calamitous day and night in Baltimore, drinking himself to oblivion. He died at 40.

Had he lived, he would have found it ever more difficult to “revolutionize the world of Physical & Metaphysical Science.” Mr. Tresch, who teaches at the Warburg Institute at the University of London and has previously written about Romanticism and science in 19th-century France, shows that the last years of Poe’s life coincided with increased regimentation in American thought. New organizations such as the American Association for the Advancement of Science began applying rigorous standards to scientific discourse. “Eureka” was “precisely the kind of publicly oriented, freewheeling, generalizing, idiosyncratic, and unlicensed speculation that the AAAS was created to exclude,” he writes.

For the full review, see:

Jeremy McCarter. “Mystery, Science, Theater.” The Wall Street Journal (Saturday, June 12, 2021 [sic]): C7.

(Note: ellipses added.)

(Note: the online version of the review was updated June 11, 2021 [sic], and has the title “‘The Reason for the Darkness of the Night’ Review: Poe’s Eureka Moment.” In the online and print versions, the words “Attraction,” “Repulsion,” and “Eureka” in Poe quotes appear in italics.)

The book under review is:

Tresch, John. The Reason for the Darkness of the Night: Edgar Allan Poe and the Forging of American Science. New York: Farrar, Straus and Giroux, 2021.

Allowing the Sale of Hearing Aids Over-the-Counter (O.T.C.) Results in “Increased Innovation and Lower Prices”

(p. D3) A year ago, the Food and Drug Administration announced new regulations allowing the sale of over-the-counter hearing aids and setting standards for their safety and effectiveness.

. . .

Some background: In 2020, the influential Lancet Commission on Dementia Prevention, Intervention and Care identified hearing loss as the greatest potentially modifiable risk factor for dementia.

Previous studies had demonstrated a link between hearing loss and cognitive decline, said Dr. Frank Lin, an otolaryngologist and epidemiologist at Johns Hopkins and lead author of the new research.

“What remained unanswered was, If we treat hearing loss, does it actually reduce cognitive loss?” he said. The ACHIEVE study (for Aging and Cognitive Health Evaluation in Elders) showed that, at least for a particular group of older adults, it could.

. . .

A small study recently published in JAMA Otolaryngology found that patients who were given a commercially available, self-fitting hearing aid in a clinical trial could, after six weeks, hear as well as patients fitted with the same device by audiologists.

. . .

The United States is the first country to develop a regulated O.T.C. hearing aid market, and “the tech companies and the retailers are still experimenting,” Dr. Lin pointed out. He predicts increased innovation and lower prices ahead.

For the full commentary, see:

Paula Span. “THE NEW OLD AGE; A Challenging Over-the-Counter Market for Hearing Aids.” The New York Times (Tuesday, October 31, 2023): D3.

(Note: ellipses added.)

(Note: the online version of the commentary has the date Oct. 30, 2023, and has the title “THE NEW OLD AGE; Hearing Aids Are More Affordable, and Perhaps More Needed, Than Ever.”)

The “small study” mentioned above is:

De Sousa, Karina C., Vinaya Manchaiah, David R. Moore, Marien A. Graham, and De Wet Swanepoel. “Effectiveness of an over-the-Counter Self-Fitting Hearing Aid Compared with an Audiologist-Fitted Hearing Aid: A Randomized Clinical Trial.” JAMA Otolaryngology–Head & Neck Surgery 149, no. 6 (2023): 522-30.

Musk Calls German Anti-Electric-Vehicle Ecoactivists “Dumber Than a Doorstop”

(p. B1) GRÜNHEIDE, Germany—When Tesla opened its first full-scale European factory in this sleepy community outside of Berlin, Elon Musk was feted as a hero, the chancellor gave a speech and workers cheered the rollout of new Model Ys.

On Wednesday [March 13, 2024], almost two years to the day later, Musk was back, this time to cheer up workers after an act of sabotage by suspected eco-activists shut down the plant for more than a week.

. . .

Tesla didn’t respond to requests for comment on the various incidents. In a post on his X social-media platform, Musk has called the eco-activists “dumber than a doorstop” for their criticism of electric vehicles.

As the plant’s managers and workers gathered in a tent on the factory grounds for a “team huddle” on Wednesday, Musk could be seen carrying his son. Hoisting the boy onto his shoulders amid calls of “Elon, Elon,” he shouted back: “They can’t stop us!” and “Ich liebe Dich!”—German for “I love you.”

As he left, reporters asked him whether he was still committed to expanding the plant and producing vehicles in Germany.

“Yes, absolutely,” he said. “Germany rocks!”

For the full story, see:

William Boston. “Tesla Faces Blowback in Germany.” The Wall Street Journal (Friday, March 15, 2024): B1-B2.

(Note: ellipses, and bracketed date, added.)

(Note: the online version of the story has the date March 14, 2024, and has the title “Elon Musk’s Plans to Conquer Europe Collide With Germany’s Culture Wars.”)

Surgeons Often Excise Useful Appendix Even When Antibiotics Would Have Cured–“Surgeons Who Don’t Operate Miss Out on a Hefty Fee”

(p. D7) The appendix is a finger-shaped pouch attached to the large intestine (colon), usually on the lower right side of the abdomen. Long considered a vestigial organ with no known function, many people, young and old, have theirs removed in the course of another operation.

However, there are now indications that the appendix serves as a repository of healthy bacteria that can replenish the gut after an extreme attack of diarrhea. People who have had appendectomies, for example, are more likely to experience recurrent infections with the bacterium Clostridium difficile, a debilitating intestinal infection that causes severe, difficult-to-treat diarrhea.

. . .

Acute appendicitis is the nation’s most common surgical emergency. . . . Some 300,000 people in the United States undergo an appendectomy each year, but sometimes, the appendix turns out not to have been inflamed, meaning the operation was not necessary.

The results of several recent studies suggest that patients with uncomplicated appendicitis should not be rushed into surgery and instead should be offered the option of a trial of antibiotics.

In a controlled study among 540 adult patients, 72.7 percent of 257 patients randomly assigned to take antibiotics in lieu of an operation did not require subsequent surgery a year later, and those who did need surgery had no bad effects from the delay.

In another nonrandomized study of 3,236 patients who were not operated on initially, the nonsurgical treatment failed to cure the appendicitis in 5.9 percent of cases, and the inflammation recurred in 4.4 percent.

Some patients may choose an operation so they won’t have to worry about developing another attack of appendicitis, but if they aren’t told they have a choice, they can hardly make one.

Writing in JAMA [in February 2016] . . ., Dr. Dana A. Telem, a surgeon at Stony Brook University Medical Center, noted that “the notion of nonoperative treatment of appendicitis has not been well-received by the majority of the surgical community.” This is hardly surprising, because doctors, like many of us, are creatures of habit, and surgeons who don’t operate miss out on a hefty fee.

For the full story see:

JANE E. BRODY. “PERSONAL HEALTH; A Choice for Treating Appendicitis.” The New York Times (Tuesday, March 22, 2016 [sic]): D7.

(Note: ellipses, and bracketed words, added.)

(Note: the online version of the story has the date March 21, 2016 [sic], and has the title “PERSONAL HEALTH; A New View of Appendicitis.”)

The controlled randomized study mentioned above is:

Salminen, Paulina, Hannu Paajanen, Tero Rautio, Pia Nordström, Markku Aarnio, Tuomo Rantanen, Risto Tuominen, Saija Hurme, Johanna Virtanen, Jukka-Pekka Mecklin, Juhani Sand, Airi Jartti, Irina Rinta-Kiikka, and Juha M. Grönroos. “Antibiotic Therapy Vs Appendectomy for Treatment of Uncomplicated Acute Appendicitis: The Appac Randomized Clinical Trial.” JAMA 313, no. 23 (2015): 2340-48.

The nonrandomized study mentioned above is:

McCutcheon, Brandom A., David C. Chang, Logan P. Marcus, Tazo Inui, Abraham Noorbakhsh, Craig Schallhorn, Ralitza Parina, Francesca R. Salazar, and Mark A. Talamini. “Long-Term Outcomes of Patients with Nonsurgically Managed Uncomplicated Appendicitis.” Journal of the American College of Surgeons 218, no. 5 (May 2014): 905-13.

“The Economic Mobility That Springs From Property Ownership”

(p. C9) Mr. Husock, a senior fellow at the American Enterprise Institute, traces the progress of a seemingly sensible but ultimately destructive idea: that “low-income neighborhoods built by ordinary builders were exploitative, overcrowded, and dangerous.”

. . .

What these reformers failed to understand, Mr. Husock contends, is that the poor neighborhoods of large cities provided what planned and subsidized neighborhoods never could: tightly knit communities, a sense of belonging and attendant political participation, ethnic character and the economic mobility that springs from property ownership.

. . .

The unreformers, Mr. Husock writes, “understood something fundamental: Community develops when keeping one’s property becomes part of a positive conspiracy of shared self-interest.”

For the full review, see:

Barton Swaim. “The Tragedy of the Progressive City.” The Wall Street Journal (Saturday, Oct. 30, 2021 [sic]): C9.

(Note: ellipses added.)

(Note: the online version of the review has the date October 29, 2021 [sic], and has the title “Politics: When the Lights Go Down in the City.”)

The book under review is:

Husock, Howard A. The Poor Side of Town: And Why We Need It. New York: Encounter Books, 2021.

As Temps Rise, Trees Adapt to Global Warming by Slowing Their Increasing Release of Carbon Dioxide

The late great physicist Freeman Dyson was courageously skeptical of global warming based on forces that move Earth back toward equilibrium when initially nudged away. The story quoted below provides evidence consistent with Dyson’s narrative.

(p. D2) The bend-don’t-break adaptability of trees extends to handling climate change, according to a new study that says forests may be able to deal with hotter temperatures and contribute less carbon dioxide to the atmosphere than scientists previously thought.

In addition to taking in carbon dioxide during photosynthesis, plants also release it through a process called respiration. Globally, plant respiration contributes six times as much carbon dioxide to the atmosphere as fossil fuel emissions, much of which is reabsorbed by plants, the oceans and other elements of nature. Until now, most scientists have thought that a warming planet would cause plants to release more carbon dioxide into the atmosphere, which in turn would cause more warming.

But in a study published Wednesday [March 16, 2016 [sic]] in Nature, scientists showed that plants were able to adapt their respiration to increases in temperature over long periods of time, releasing only 5 percent more carbon dioxide than they did under normal conditions.

Based on measurements of short-term temperature responses in this study and others, the scientists expected that the plants would increase their respiration by nearly five times that much.

At two forest-research sites in Minnesota, scientists tested how the respiration rates of 10 different species of trees — from boreal and temperate forests — were affected by increases in temperature over a period of three to five years, using heating cables to warm some of the trees.

The trees were monitored in two conditions: ambient, and about 6 degrees warmer than that.

To demonstrate how the plants adapted to long-term temperature increases, the scientists compared three things: how much carbon dioxide the trees released in ambient conditions; how much the trees released in the warmer conditions; and how much carbon dioxide the trees released when they were exposed to the warmer temperature for a short period of time (minutes or hours).

When the scientists compared the results, they found that the trees that were acclimated to the warmer temperatures increased their carbon dioxide release by a much smaller amount than the trees that were only exposed to a short-term temperature increase of the same magnitude.

Boreal and temperate forests account for a third of the world’s forest areas. If they are able to adapt respiration rates as this study suggests, the planet will breathe easier.

The source of the story is:

Tatiana Schlossberg. “Energy Appetite in U.S. Endangers Goals on Climate.” The New York Times (Tuesday, March 22, 2016 [sic]): D2.

(Note: bracketed date added.)

(Note: the online version of the story was updated March 16, 2016 [sic], and has the title “Trees Deal With Climate Change Better Than Expected.” The last two sentences quoted above differ in a non-trivial way in the print and the online versions. Above I choose to quote the less politically correct print version. The wimpish politically correct online version is: “Boreal and temperate forests account for a third of the world’s forest areas, and if they adapt their respiration rates in the way this study suggests, the forests, the planet’s lungs, can breathe easy.”)

The Nature article mentioned above is:

Reich, Peter B., Kerrie M. Sendall, Artur Stefanski, Xiaorong Wei, Roy L. Rich, and Rebecca A. Montgomery. “Boreal and Temperate Trees Show Strong Acclimation of Respiration to Warming.” Nature 531, no. 7596 (March 16, 2016): 633-36.

Researchers and Entrepreneurs Experiment with Once-Taboo Geoengineering Projects to Reverse Global Warming

(p. A3) Dumping chemicals in the ocean? Spraying saltwater into clouds? Injecting reflective particles into the sky? . . .

These geoengineering approaches were once considered taboo by scientists and regulators who feared that tinkering with the environment could have unintended consequences, but now researchers are receiving taxpayer funds and private investments to get out of the lab and test these methods outdoors.

. . .

In Israel, a startup called Stardust Solutions has begun testing a system to disperse a cloud of tiny reflective particles about 60,000 feet in altitude, reflecting sunlight away from Earth to cool the atmosphere in a concept known as solar radiation management, or SRM. Yanai Yedvab, Stardust chief executive and a former deputy chief scientist at the Israel Atomic Energy Commission, wouldn’t disclose the composition of the proprietary particles.

Yedvab said Stardust has raised $15 million from two investors and has conducted low-level aerial tests using white smoke to simulate the particles’ path in the atmosphere. After the company completes indoor safety testing, it intends to conduct a limited outdoor test of the dispersion technology, monitoring devices and particles in the next few months, Yedvab said.

. . .

Experiments aimed at cooling the atmosphere by reflecting sunlight away from Earth are an attempt to mimic what happens when a volcano erupts. In 1991, Mount Pinatubo, an active volcano in the Philippines, spewed sulfur and ash into the upper atmosphere, lowering the Earth’s temperature by .5 degrees Celsius (.9 degrees Fahrenheit) for an entire year.

For the full story, see:

Eric Niiler. “New Experiments Aim to Cool Planet.” The Wall Street Journal (Thursday, February 15, 2024): A3.

(Note: ellipses added.)

(Note: the online version of the story has the date February 14, 2024, and has the title “Scientists Resort to Once-Unthinkable Solutions to Cool the Planet.” The online version says that the title of the print version was also “Scientists Resort to Once-Unthinkable Solutions to Cool the Planet.” But my print version has the title “New Experiments Aim to Cool Planet.”)

Mandated Fukushima Evacuations Killed 1,600; Radiation Killed 0

Berkeley scientist Noah Whiteman’s Most Delicious Poison argues that often chemicals that are therapeutic at low doses are poisons at high doses. The commentary quoted below provides evidence that what Whiteman argues is true of many chemicals, is also true of radiation.

(p. D3) This spring [2015], four years after the nuclear accident at Fukushima, a small group of scientists met in Tokyo to evaluate the deadly aftermath.

No one has been killed or sickened by the radiation — a point confirmed last month by the International Atomic Energy Agency. Even among Fukushima workers, the number of additional cancer cases in coming years is expected to be so low as to be undetectable, a blip impossible to discern against the statistical background noise.

But about 1,600 people died from the stress of the evacuation — one that some scientists believe was not justified by the relatively moderate radiation levels at the Japanese nuclear plant.

. . .

“The government basically panicked,” said Dr. Mohan Doss, a medical physicist who spoke at the Tokyo meeting, when I called him at his office at Fox Chase Cancer Center in Philadelphia. “When you evacuate a hospital intensive care unit, you cannot take patients to a high school and expect them to survive.”

Among other victims were residents of nursing homes. And there were the suicides. “It was the fear of radiation that ended up killing people,” he said.

Most of the fallout was swept out to sea by easterly winds, and the rest was dispersed and diluted over the land. Had the evacuees stayed home, their cumulative exposure over four years, in the most intensely radioactive locations, would have been about 70 millisieverts — roughly comparable to receiving a high-resolution whole-body diagnostic scan each year. But those hot spots were anomalies.

By Dr. Doss’s calculations, most residents would have received much less, about 4 millisieverts a year. The average annual exposure from the natural background radiation of the earth is 2.4 millisieverts.

How the added effect of the fallout would have compared with that of the evacuation depends on the validity of the “linear no-threshold model,” which assumes that any amount of radiation, no matter how small, causes some harm.

Dr. Doss is among scientists who question that supposition, one built into the world’s radiation standards. Below a certain threshold, they argue, low doses are harmless and possibly even beneficial — a long-debated phenomenon called radiation hormesis.

. . .

Life evolved in a mildly radioactive environment, and some laboratory experiments and animal studies indicate that low exposures unleash protective antioxidants and stimulate the immune system, conceivably protecting against cancers of all kinds.

. . .

. . ., a study of radon by a Johns Hopkins scientist suggested that people living with higher concentrations of the radioactive gas had correspondingly lower rates of lung cancer. If so, then homeowners investing in radon mitigation to meet federal safety standards may be slightly increasing their cancer risk. These and similar findings have also been disputed.

. . .

There is more here at stake than agonizing over irreversible acts, like the evacuation of Fukushima. Fear of radiation, even when diluted to homeopathic portions, compels people to forgo lifesaving diagnostic tests and radiotherapies.

We’re bad at balancing risks, we humans, and we live in a world of continual uncertainty. Trying to avoid the horrors we imagine, we risk creating ones that are real.