Science Simplified!

Comment

Comment by Dr. Krishna Kumari Challa on Tuesday

No cities on the moon—there isn't enough water, scientists say

The discovery of water in dark craters at the moon's poles has sparked a "moon rush" to establish bases there, followed by villages, cities and heavy industry. How sustainable is this rush?

Soon after the moon was formed, asteroids bombarded it, creating its pockmarked topography. Near the moon's poles, there are dozens of crater floors that have not seen direct sunlight in about 4 billion years. Many of these cryogenically cold "pits of eternal darkness" are below a temperature of 110K, forming "cold traps" in which water ice won't sublimate away by more than a millimeter in a billion years, even in the vacuum at the moon's surface. And there is water to freeze: Some of those asteroids brought it along with them.

Since 2013, we have known that water is still there, possibly as much as 1 billion tons (910 million tonnes), thanks to a succession of moon-orbiting missions that have mapped likely locations in increasing detail.

The presence of water at the lunar poles changes everything about human visits to the moon. Suddenly, it is practical to envision a "moon village" where people could survive without importing every last bit from Earth. They could grow their own food and have showers and functional toilets, unlike the astronauts on the International Space Station (ISS). This possibility has sparked ambitions from people like Jeff Bezos to move heavy industry to the moon and Elon Musk's ambition to have "self-growing cities" there. These are enticing visions, but are they attainable?
Lunar polar water ice could support small settlements for centuries, aided by near-continuous solar power on crater rims. Even with 98% water recycling, a million-person city would exhaust optimistic ice estimates within about a century; lower current estimates reduce this to years or decades. Larger settlements require improved recycling, imports, reduced demand, or deeper water reserves.

This is the conclusion of scientists!

No Cities on the Moon: a Billion Tons of Water is not enough for Sustainability, Frontiers in Space Technologies (2026). DOI: 10.3389/frspt.2026.1894104

Comment by Dr. Krishna Kumari Challa on Tuesday

To assess whether cefepime carries a higher risk of patient death than other β-lactam antibiotics, researchers conducted a systematic review of 110 randomized clinical trials with available mortality data, comparing cefepime with alternative β-lactams in both adults and children.

Using a statistical tool called Bayesian random-effects meta-analysis, the team pooled patient outcomes across studies and calculated the statistical probability of increased mortality associated with cefepime.

The data revealed an increased mortality risk associated with cefepime, which was concentrated entirely in adult patients, with children showing no increased risk of death.

Across all patients, the researchers estimated a number needed to harm of 227, meaning that for every 227 patients treated with cefepime, approximately one additional death would occur. However, when they focused only on the 15,411 patients in published, peer-reviewed trials, the probability that cefepime increases mortality rose to 98.6%, with the number needed to harm reduced to 111.
The highest probability of harm was seen in patients treated for febrile neutropenia, at 96.1%. They also found that standard and high doses, 2 grams every 12 hours or more, had a greater than 93% probability of harm, while lower doses still carried an 80.5% probability of harm.

The researchers stress that the results should not be interpreted as a call for abandoning cefepime. Instead, cefepime's potential link to increased mortality established in this study should be taken into consideration when framing its role in clinical practice guidance.

Future studies could explore whether tailoring cefepime dosing and closely tracking factors such as kidney function and bacterial susceptibility can improve safety.

Zahra N. Sohani et al, Cefepime and Mortality, JAMA Network Open (2026). DOI: 10.1001/jamanetworkopen.2026.33017

Daniel Z. Uslan et al, Cefepime and Mortality—A Dosing Problem, Not a Drug Problem, JAMA Network Open (2026). DOI: 10.1001/jamanetworkopen.2026.32904

Part 2

**

Comment by Dr. Krishna Kumari Challa on Tuesday

Common antibiotic linked to possible higher death risk

Cefepime is a fourth-generation antibiotic widely used to treat serious bacterial infections and febrile neutropenia—a fever in patients with abnormally low white blood cell counts. Unlike many antibiotics that are falling prey to antimicrobial resistance, cefepime is relatively stable against AmpC β-lactamases, giving it an advantage against bacteria that produce these enzymes. However, scientists are concerned that this widely effective antibiotic may increase the risk of death, a concern first brought to light by a 2007 meta-analysis.
In a recent study published in JAMA Network Open, researchers re-examined data from a series of clinical trials and studies to investigate whether patients treated with cefepime were more likely to die than those treated with other β-lactam antibiotics.

After analyzing more than 100 randomized trials involving 22,608 patients, researchers found a 94.4% probability that cefepime was associated with higher odds of death than other β-lactam antibiotics. Across all the trials screened, death occurred in 6.6% of cefepime-treated patients and 6.2% of comparison-group patients.

Cefepime was approved for medical use in 1994, but a study raised concerns about its safety only after it had been in clinical practice for a decade. In 2007, a meta-analysis by Yahav et al. found that patients treated with cefepime had a 26% higher relative risk of death than those treated with other β-lactam antibiotics.

Further studies suggested two possible mechanisms, both related to drug exposure rather than cefepime itself. The first is underexposure, in which a lower-than-required dose is prescribed, leading to inadequate treatment. The other is overexposure, which could cause neurotoxicity, especially when kidney function is impaired or dosing is not adjusted.

Later, the FDA released data showing no significant increase, but doubts about the drug's safety still linger because the meta-analysis included some unpublished, industry-sponsored data.

Cefepime remains the first line of defense against life-threatening conditions such as febrile neutropenia and severe bacterial infections, especially those caused by multidrug-resistant microorganisms, as it provides targeted activity against both aggressive gram-positive and gram-negative pathogens. Thus, establishing whether it is safe is essential to guiding its use in clinical practice.

Part 1

Comment by Dr. Krishna Kumari Challa on September 13, 2026 at 11:30am

Scientists Found an Animal That Fixes Its Shattered DNA Across Generations

In the mosses and lichens of the world – the in-between places, where living conditions rapidly fluctuate – lives a tiny animal with an extraordinary survival skill.

No, not tardigrades – it's their much weirder housemate, the bdelloid rotifer.

Just like tardigrades, bdelloid rotifers can dry out almost completely and spring back to life when water returns. They can be blasted with radiation hundreds of times greater than what would kill a human, and live to tell the tale, even while their chromosomes are shattered.

And now, scientists have discovered, one bdelloid rotifer can do something never before documented in any other living organism, even tardigrades: A species called Adineta vaga can reproduce without putting its chromosomes back together after radiation damage – and its offspring will continue fixing the damage over generations.

What's really exceptional in this discovery is that somehow they stabilize the ends of the chromosome; they stabilize these DNA pieces, and then they can transmit it to the next generation and then continue the repair.
That's never been shown, that you have this repair across generations.

https://www.science.org/doi/10.1126/sciadv.aee0891

Comment by Dr. Krishna Kumari Challa on September 13, 2026 at 11:26am

Watch 'Conversations' Between Cells Across Organ Systems

Demonstrations of the WHOLISTIC imaging technique reveal real-time cellular signalling across the body of a zebrafish larvae.

Comment by Dr. Krishna Kumari Challa on September 12, 2026 at 9:12am

What's carving active gullies on Mars? It's not water!

Spectral observations at Sisyphi Cavi show no springtime water-ice signature near active gullies, while salts and clays occur elsewhere. CO2 geyser activity peaks before gully formation. The gullies are therefore most consistent with CO2 frost fluidization, in which sublimating gas lubricates debris-rich dry-ice flows that erode slopes.

Apolline Leclef et al, Properties of Seasonal Ice at Sisyphi Cavi and Implications for Current Modification of Martian Gullies, arXiv (2026). DOI: 10.48550/arxiv.2609.03885

Comment by Dr. Krishna Kumari Challa on September 12, 2026 at 9:10am

How western consumption becomes the Global South's environmental nightmare

Exports of used textiles and electronics from industrialized countries often shift disposal, pollution and health burdens to Global South regions with limited waste-management capacity. Although reuse and repair create economic value, unsellable goods and hazardous e-waste concentrate harms locally. Circular economy systems require cross-border producer responsibility, funding and protections.

original article.

Comment by Dr. Krishna Kumari Challa on September 12, 2026 at 9:07am

Regular use of eyelash extensions linked to skin mites, eye irritation and blocked glands

Eyelash extensions are an extremely popular cosmetic procedure among young women because they provide the appearance of longer and fuller eyelashes without the need for mascara. At the same time, there is growing evidence suggesting that this procedure may create problems on the surface of the eye, including irritation, dry eye symptoms, and meibomian gland dysfunction.

A study among young women who regularly have eyelash extensions has found most have tiny mites, called Demodex folliculorum, living on their lashes. These mites can cause a painful skin reaction called demodicosis.

The research, presented last week at the 44th Congress of the European Society of Cataract and Refractive Surgeons (ESCRS), also shows that many of the women have symptoms of eye irritation and most have problems with the tiny glands near the eyelashes, called meibomian glands, that produce an oily substance to prevent the eyes from drying out.
Among the women who had had eyelash extensions at least 10 times, researchers found most (85%) had signs of meibomian gland dysfunction. This means the glands were blocked or not producing the right oil to keep eyes hydrated.

It was also found that samples of eyelashes from 25 women who regularly had eyelash extensions, harboured Demodex folliculorum skin mites. In 18 of the women, there were signs of skin irritation typically caused by skin mites, including itching and irritation around the eyelids, redness, swelling, eyelashes sticking together, and scaly skin at the base of the lashes.

Researchers say that some simple hygiene steps, such as cleaning the eyelashes and treating mite infestation when needed, could make eyelash extensions much safer.
The findings do not suggest that people should completely avoid eyelash extensions. However, they highlight the importance of proper eyelid hygiene, awareness of symptoms and timely assessment when symptoms arise. For optimal care of eyelash extensions, the use of a preservative-free, hypoallergenic gel designed for therapeutic eyelid hygiene may be recommended twice daily using an eyelash cleansing brush. In individuals with confirmed Demodex infestation, a course of antiparasitic treatment may be considered.

https://www.escrs.org/channels/news/regular-use-of-eyelash-extensio...

Comment by Dr. Krishna Kumari Challa on September 12, 2026 at 8:59am

Drinking very hot tea and coffee is linked to a greater risk of esophageal cancer

A study of almost 1 million tea and coffee drinkers has linked very hot drinks to a threefold greater risk of developing one type of esophageal cancer.
This isn't the first time hot beverages have been linked to cancer. Earlier studies in Asia, Africa, South America and the Middle East found an association, but there has been far less evidence from Western populations. However, this research showed that temperatures typical of U.K. drinking habits were also linked to an increased risk.
But how much difference could everyday drinking habits actually make? To find out, scientists turned to a vast health data set. Researchers analyzed data from 977,282 adults who were asked about their hot drink consumption habits, whether they preferred their drinks warm, hot or very hot, and how many cups of tea and coffee they drank daily.

They then tracked participants' health data through NHS (National Health Service) records for more than a decade. In particular, they were on the lookout for new diagnoses of esophageal cancer while taking into account lifestyle factors like smoking, alcohol intake and body weight.

During the study period, 2,348 participants developed esophageal cancer, which affects the esophagus, the tube connecting the mouth to the stomach. However, the data revealed an important difference. When the team separated the cases and looked at the different types of esophageal cancer, they found that higher drink temperatures were not linked to them equally, as they write in their paper published in the International Journal of Cancer.

Drinking very hot beverages, as opposed to warm beverages, was linked to a threefold higher risk of squamous cell carcinoma (SCC), a type of esophageal cancer that forms in the thin, flat cells lining the inside of the esophagus. People who preferred their drinks hot also faced an elevated risk, though not nearly as steep as those who preferred them very hot.

But temperature wasn't the only thing that mattered. The number of drinks consumed daily was also a factor. People who drank six or more cups of tea or coffee a day saw their risk of SCC jump significantly compared with those who drank fewer cups. The association was similar regardless of whether people primarily drank tea or coffee, suggesting that the risk came from the temperature of the liquid rather than any specific ingredient.
Because the cancer risk was linked to temperature, the scientists offer straightforward advice. "These findings suggest that reducing drink temperature in populations where tea and coffee are frequently consumed could offer an important means of SCC prevention."

Keren Papier et al, Hot Drinks and Oesophageal Cancer: Prospective Analyses in Around 1 Million UK Adults, International Journal of Cancer (2026). DOI: 10.1002/ijc.70654

**

Comment by Dr. Krishna Kumari Challa on September 11, 2026 at 1:34pm

Shrinking Planet
Even planets develop wrinkles as they age. As the planet Mercury shrinks, more “wrinkles” (in the form of hills and ridges) emerge, and scientists are trying to measure them. A new study focused on the planet’s surface roughness, such as craters and debris, and found that particularly rough areas have made the wrinkles harder to see. The analysis revealed that the planet has shrunk up to 14.5 miles in its history, 30 percent more than scientists previously thought.
​

• ‹ Previous
• 1
• 2
• 3
• 4
• 5
• 6
• …
• 1295
• Next ›
• Page