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Comment by Dr. Krishna Kumari Challa on Sunday

Dogs respond to human tone without words, hinting at communication older than language

Humans can communicate various instructions to dogs without using actual words—simply by modulating the tone of their voice, a new study shows. By repeating the nonsense syllable 'bü' in different intonations, humans successfully signaled "Yes," "No," "Here," and "There" and, remarkably, dogs responded correctly, despite receiving no prior training. The findings reveal ancient acoustic codes, interpretable across species, that predate language itself.

Dogs accurately interpret human intentions such as affirmation, prohibition, and spatial direction based solely on vocal tone, even without word use or prior training. Specific acoustic features—such as pitch, smoothness, and call duration—encode these meanings, indicating the presence of ancient, cross-species vocal communication codes that predate language.

Anna Gábor et al, Cross-species acoustic codes for yes and no in human nonverbal vocalizations, Cognition (2026). DOI: 10.1016/j.cognition.2025.106284

"Yes" and "no" are among the most commonly used words. But the origins of these simple meanings are older than language, and even older than humans.

Comment by Dr. Krishna Kumari Challa on Sunday

The perks of polyandry: Mating with multiple males leads to home improvement for African tree frogs

The question of why females mate with multiple males has long puzzled evolutionary biologists. A new study of African foam-nest tree frogs, led by University of Wollongong (UOW) researchers, reveals polyandry could be the key to reproductive success and a safer home for offspring. The findings shed light on how amphibians have evolved to protect their young in challenging environments, presenting a new hypothesis for the evolution of polyandry that ties mating behavior to the quality of nest construction.
Polyandry in African foam-nest tree frogs results in larger, more robust nests that are less likely to fail, enhancing offspring survival. Multiple males assist in nest construction and gain partial paternity, indicating cooperative rather than competitive reproductive behaviour. These findings suggest that nest-building requirements may drive the evolution of polyandry in various animal species.

Phillip G Byrne et al, "Nesting assistance": a new hypothesis for the evolution of polyandry and a test in an African foam-nesting treefrog, Evolution (2026). DOI: 10.1093/evolut/qpag071

Comment by Dr. Krishna Kumari Challa on Sunday

Cells have a built-in 'seatbelt' against sudden stress

When cells experience sudden physical stress, like stretching or pressure, they can activate a fast, protective mechanism that shields their nuclei from destruction, according to a new study published in the Biophysical Journal. This mechanism could help scientists develop therapies to prevent DNA damage, a major driver of aging and cell death.

Epithelial cells rapidly form an actin-based ring around their nuclei in response to acute mechanical or osmotic stress, providing immediate physical protection and reducing nuclear rupture and DNA damage. This transient structure increases lamin A/C expression, stiffening the nuclear membrane. Impaired actin ring formation leads to increased DNA damage and cell death, suggesting a potential link to aging.

Aging cells tend to have lower levels of actin in them, which means they may not produce the ring structure as effectively as healthy cells.

Transient Perinuclear Actin Rings Prevent Cell Aging And Apoptosis Via Nuclear Mechanical Protection, Biophysical Journal (2026). DOI: 10.1016/j.bpj.2026.04.035

Comment by Dr. Krishna Kumari Challa on Sunday

Biomaterial made from jackfruit latex is a promising treatment for periodontitis

A biomaterial composed of jackfruit latex, pomegranate peel extract, and simvastatin forms a mucoadhesive matrix that enhances osteoinduction in vitro, indicating potential for periodontal tissue regeneration. The formulation supports localized drug delivery, increases bone formation, and may reduce systemic side effects compared to oral simvastatin.

Bruna V. Quevedo et al, Jackfruit latex-pomegranate extract biomaterial incorporated with simvastatin as a potential osteoinductive system for periodontal applications, Polymer Bulletin (2026). DOI: 10.1007/s00289-026-06358-w

Comment by Dr. Krishna Kumari Challa on Sunday

Why doesn't coffee taste like caffeine?

Through a series of tests aided by a trained panel, researchers discovered that caffeine must be interacting with other molecules present in coffee that significantly reduce its bitterness. In fact, coffee masked caffeine's distinctive taste until researchers added 10 times the normal amount of caffeine present in a typical brew.
Caffeine is highly bitter in isolation, but its bitterness is significantly reduced in coffee due to interactions with melanoidins and chlorogenic acid formed during roasting. These compounds, especially melanoidins, likely bind caffeine, preventing it from activating bitter taste receptors and resulting in coffee's characteristic, less bitter flavour profile.
To find the coffee molecules responsible for this effect, the team ran taste-tests of caffeine in solution combined with additional compounds: chlorogenic acid, which is naturally present in coffee beans, and/or melanoidins, which are products of the Maillard reaction that occurs during roasting.

The tasting panel found that when both compounds were combined with caffeine, the bitter taste was reduced by about half. Frank suspects that caffeine and melanoidins form a complex that—due to its size—prevents interaction with the bitter taste receptors on our tongues. The strength of the bond between caffeine and melanoidins may differ between different roasting processes, though future work is needed on this point.

A plethora of bitter stimuli, generated during the roasting process, culminate in the unique, bitter taste of coffee beverages.

Michael Gigl et al, Impact of Interactions between Melanoidins and Caffeine on the Bitter Taste of Coffee Beverages, Journal of Agricultural and Food Chemistry (2026). DOI: 10.1021/acs.jafc.5c17022

Comment by Dr. Krishna Kumari Challa on June 6, 2026 at 12:27pm

Worm tablet could be repurposed as brain cancer treatment
Mebendazole, an antiparasitic drug, demonstrated consistent tumor growth inhibition and increased survival in laboratory and animal models of brain cancer, acting through multiple anticancer mechanisms and enhancing effects of chemotherapy and radiotherapy. However, human studies show limited and inconsistent efficacy, indicating that mebendazole remains an unproven candidate requiring further clinical trials before routine use in brain cancer treatment.

Ciara B. Blum et al, From anthelmintic to neuro‐oncology: A systematic review of mebendazole repurposing for brain tumour therapy, British Journal of Clinical Pharmacology (2026). DOI: 10.1002/bcp.70565

Comment by Dr. Krishna Kumari Challa on June 6, 2026 at 11:34am

AI fails classic attention test, with longer word lists triggering dramatic accuracy collapse
Transformer-based large language models exhibit a dramatic decline in accuracy on the Stroop task as word list length increases, particularly when word meaning and ink colour are mismatched. Unlike humans, who maintain high accuracy regardless of list length, LLMs default to word reading and fail to sustain task focus, indicating fundamental limitations in their attention mechanisms compared to biological systems.

Suketu Chandrakant Patel et al, Deficient executive control in transformer attention, PNAS Nexus (2026). DOI: 10.1093/pnasnexus/pgag149

Comment by Dr. Krishna Kumari Challa on June 6, 2026 at 8:49am

Previous studies have established how social media and online trends can have an impact on public health concerns and behaviors. So, the researchers investigated what people were searching for on the internet and compared what was being said in the media. They input keywords such as "vitamin A measles" and "cod liver measles" in Google Search Trends to see how often people in the U.S. searched for the terms between January and June 2025. Alongside this, they closely monitored press coverage, online mentions and social media statements on the topics.

The researchers found that interest in vitamin A and cod liver oil surged after public figures and government officials began promoting vitamin A. Searches for vitamin A rose 7.5 percentage points above expected levels, while searches for cod liver oil increased by 1.3 points. At the same time, poison centers reported a significant rise in exposure to dangerous amounts of vitamin A, most of them involving children.

The findings provide a clear example of how quickly media messaging might shape health-seeking behavior during public health crises such as measles outbreaks. Misinformation about health can have lasting impacts on a person's life, which calls for prompt attention and debunking by public health officials.

Anne Christine Bischops et al, Internet Searches for Vitamin A and Related Media Statements During the 2025 US Measles Outbreak, JAMA Network Open (2026). DOI: 10.1001/jamanetworkopen.2026.15013

Part 2

Comment by Dr. Krishna Kumari Challa on June 6, 2026 at 8:49am

Vitamin A poisonings rose almost 40% as measles misinformation spread in 2025

There can be too much of a good thing, and that has been the case with Vitamin A.
A recent study in JAMA Network Open has found that between January and March 2025, America's Poison Centers reported a 38.7% increase in vitamin A exposures during the measles outbreak across many states.
While it is not unusual for people to reach for acetaminophen (Tylenol) or ibuprofen to relieve fever or pain, the sudden interest in vitamin A in response to the measles outbreak was neither expected nor evidence-based, as it does not prevent measles. So what led to this uptick in search?

The researchers found that the surges coincided with two key events: the first of several media statements promoting vitamin A as a measles treatment on February 19, 2025, and comments by Dr. Suzanne Humphries on the hugely popular The Joe Rogan Experience podcast, where she promoted vitamin A and cod liver oil as treatments for measles. Misinformation, especially in a world that is chronically online, often spreads like wildfire.
Measles, also known as rubeola, is a viral disease that causes a high fever, cough, runny nose, red eyes, and a widespread rash. It spreads through the air when an infected person coughs or sneezes, and the virus can remain airborne for up to two hours after they leave the room. Measles can also cause serious complications, including pneumonia, brain swelling, and even death, particularly among young children and people with weakened immune systems.

Measles was once a common childhood illness, but thanks to vaccination, an estimated 59 million deaths from measles between 2000 and 2024 were prevented. The U.S. successfully eradicated the disease in 2000, and the 2025 measles outbreak has been the largest since then. The reluctance to vaccinate children against the disease is a major reason for the resurgence.
Along with hesitancy, interest also grew in alternative methods to prevent the disease, such as vitamin A and cod liver oil. Vitamin A is essential for good vision, skin, hair, and immunity, and can support recovery from measles when used under medical supervision. However, it does not prevent infection, and—when taken in excessive amounts—can lead to nausea, headaches, dizziness, and liver damage.
Part 1

Comment by Dr. Krishna Kumari Challa on June 5, 2026 at 2:43pm

Physicists Just Achieved 'Perfect Randomness' For The First Time Ever

One of the hardest things to do in physics is to generate true, provably unpredictable randomness. That's because it's impossible to determine randomness based on the output alone. Dice may have nicks and flaws that influence how they roll. Computer random-number generators are usually driven by algorithms. Even coin flips are governed by physical forces that, in theory, could be predicted. The difficulty lies not in generating numbers that appear random, but in showing that no one could have possibly predicted the outcome – that the system isn't secretly affected by subtle hidden rules or biases. Now, a team of physicists at ETH Zurich in Switzerland has overcome that challenge by leveraging one of the strangest phenomena in quantum mechanics: entanglement. The resulting sequence of zeros and ones is now really perfectly random, and they can even certify that!

https://www.nature.com/articles/s41586-026-10521-8

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