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Comment by Dr. Krishna Kumari Challa 1 hour ago

Your brain doesn't forget when you forgive—it does something far more surprising with those painful memories

It is easy to say forgive and forget. But  brains don't work that way.

Forgiving someone might not erase painful memories, but it can subtly update them, making past hurts feel less upsetting. It's less "forgive and forget," and more "forgive and update."

Psychologists have long known that forgiveness is crucial for healing rifts and keeping social bonds strong. Folk wisdom even advises us to "forgive and forget" after a wrong, implying that saying you forgive someone should make the bad memory vanish.

But forgiving doesn't actually make you forget, say neuro-scientists.

When you forgive someone for a wrongdoing, you don't forget the event. But once you forgive, the memory doesn't hurt as much. Indeed, past studies hinted that forgiving someone can blunt the memory of their misdeed. What hasn't been clear is how that happens in the brain. Is the memory simply erased, or does it get rewritten?

To test this, researchers staged a simple forgiveness experiment under an fMRI scanner.

What is happening in the mind that is forgiving?

The fMRI scans pointed to two key brain areas lighting up during these forgiveness trials. One was the dorsomedial prefrontal cortex (DMPFC), a region known for "mentalizing," thinking about another person's perspective and intentions. The other was the posterior hippocampus, a zone crucial for storing detailed episodic memories.

When volunteers forgave, the activity patterns in these areas during the second-day viewing of an image looked much like the patterns during the first-day forgiveness of that image. In other words, the brain seemed to have folded the new forgiving perspective into the original memory.

The data showed that "information from the moment of forgiveness becomes incorporated into the memory" of the event. The authors summarize it neatly: "Instead of 'forgive and forget,' forgiveness may involve a 'forgive and update' process, revising memories to aid reconciliation."

When we forgive, we create a new story (e.g., "they had a reason and are sorry") that gets woven into the old memory. By the next day, thinking of the situation has a slightly altered version where you can sympathize with the offender and feel less enraged.

What does that mean?

The findings suggest that the brain's natural learning and memory system is at play: just as a new fact learned soon after an event can slip into the original memory (a process known as reconsolidation), forgiving someone seems to insert empathy and context into our recollection.

As of now, the message is one of hope; forgiving may not make someone literally forget a hurt, but it can make it hurt less. This could explain why people feel lighter and more peaceful after successfully forgiving someone. Promoting forgiveness might be a subtle way to edit painful memories, not erase them altogether.

Songzhi Wu et al, Forgiveness updates interpersonal memories to be less negative., Emotion (2026). DOI: 10.1037/emo0001611

Comment by Dr. Krishna Kumari Challa 1 hour ago

A distinct communication subspace in the brain turns goals into actions

Humans continuously adapt their actions and behaviours in response to changes in their surrounding environment. Past neuroscience studies suggest that this adaptation process relies on the brain's ability to translate abstract goals or rules into specific physical actions or behaviours, yet its neural underpinnings have not yet been clearly elucidated.

Adaptive behaviour relies on the ability to translate abstract rules and goals into actions suited to the current context.

Researchers  recently carried out a study aimed at better understanding how context-related mental representations in a region of the brain known as the prefrontal cortex (PFC) are transformed into movement plans, which are processed in the primary motor cortex (M1). Their findings, published in Nature Neuroscience, led to the identification of a distinct communication subspace that links the PFC and M1, through which contextual information that can inform the planning of actions is transmitted.

Neha Binish et al, A communication subspace relays context-dependent actions from human prefrontal to motor cortex, Nature Neuroscience (2026). DOI: 10.1038/s41593-026-02290-4.

Comment by Dr. Krishna Kumari Challa 1 hour ago

Of course, caution is needed. Bees can't tell us what they feel, and all we have are behavior scores. The scientists note they didn't record bee brain signals or thought patterns, so they stop short of claiming bees are "conscious" in our sense. And the proboscis extension (yes/no) is a simple measure—there might be subtle changes it missed. But the unexpectedly human-like breakdown under distraction strengthens the case that insects, at least, employ more than simple reflexes when they are learning tough tasks.

These results add fuel to debates on animal minds. If a bee shows "awareness-like" learning, does it have an inner experience? Even if it doesn't think as we do, the study reveals surprising flexibility in a tiny brain. In practical terms, a better understanding of bee cognition could help beekeepers and ecologists. For example, it suggests that environmental distractions (pesticides, lights, noise) might interfere with a bee's learning in the wild, affecting foraging or navigation. It also shows a model for designing AI and robots: even small neural networks can use attentional gating to solve temporal puzzles.

The study's authors emphasize that it's just a start. Future work could look at bee brain activity during such tasks or test other species to see how widespread these effects are.
For now, a striking quote from the paper stands out: "Our findings in honey bees echo [human] results: awareness of stimulus contingencies appears necessary for solving reversal learning under a trace-conditioning regime."

Catherine Macri et al, Attention, awareness and flexibility in honeybees: divergent effects of distraction on delay versus trace reversal learning, Proceedings of the Royal Society B: Biological Sciences (2026). DOI: 10.1098/rspb.2025.2891

Part 3

Comment by Dr. Krishna Kumari Challa 1 hour ago

Next, the team introduced a visual distractor, a simple flashing light, during the reversal phase. The effect was dramatic and different for each group. Delay-conditioned bees under the light started responding to both odors (an A⁺B⁺ pattern), as if they had stopped telling the scents apart. Trace-conditioned bees did the opposite: they responded to neither odor (an A⁻B⁻ pattern). In essence, the distraction caused one group to over-generalize and the other to freeze.

This split result is telling. In humans, losing awareness of the link between events can cause similar failures: either broad overreaction or blanking out, depending on the task.

The researchers explain, "Awareness of stimulus contingencies appears necessary for solving reversal learning under a trace-conditioning regime."

In other words, when the bee needs to link scent and reward across time, something like awareness is needed to keep track. The flashing light likely scrambled that process, so the bees' responses collapsed in opposite ways.
The way these bees behaved under distraction hints at more than automatic learning. As the authors state, "These findings provide evidence that bees engage awareness-like processes during trace reversal learning, highlighting cognitive processing in an insect."
That's a bold claim. It suggests that bees aren't just Pavlovian robots, but can flexibly apply attention when tasks demand it. Importantly, the experiment measured only reflexive feeding responses, not anything directly like a verbal report of awareness. Still, the binary failure patterns (respond to all vs. none) align with the idea that trace learning invokes something akin to consciousness.
Part 2

Comment by Dr. Krishna Kumari Challa 1 hour ago

Bees get distracted just like us, hinting at their own awareness

Even tiny insects need to focus. In a recent study, honey bees—usually quick to learn which scent means sugar—completely flubbed the task when a flashing light joined the party. This surprisingly human-like breakdown suggests that these little buzzers might engage something like awareness when connecting cause and effect. 

Bees are famous for their smarts. Prior work has shown that honey bees can learn complex tasks, from recognizing faces to navigating mazes. In the lab, researchers often use classical conditioning to test bee memory: An odor (conditioned stimulus) is paired with sugar (unconditioned stimulus). If the two overlap in time (delay conditioning), bees learn quickly.

However, if the sugar arrives a few seconds after the smell ends (trace conditioning), the task becomes much harder. In fact, scientists have found that bees can learn delayed tasks easily, but trace tasks falter when attention is disrupted. In other words, linking a scent to a reward across a time gap seems to need something like attention or "awareness," much as it does in humans.

In the new study, researchers took this idea further by adding a twist called reversal learning. First, bees were trained to extend their proboscis (a feeding reflex) to odor A because it predicted sugar (A⁺), but not to odor B (B⁻). After a few trials, the rule was flipped: Now B would give sugar (B⁺) and A would not (A⁻). This tested flexibility—could the bee unlearn A⁺ and learn B⁺ instead?
The scientists ran this reversal task under two conditions: delay (scent and reward overlap) and trace (reward delayed). In both cases, bees eventually mastered the new rules, but those in the trace group learned more slowly and less reliably. This was expected: Bridging the gap in trace conditioning is tougher.

Part 1

Comment by Dr. Krishna Kumari Challa on Saturday

Head Blows During Football Tied to Changes in Gut Microbiomes

Small head impacts that did not cause any symptoms were linked with microbial diversity shifts in athletes, offering clues into potential biomarkers for head trauma.
While scientists have previously shown that concussions in football players disrupt their gut microbiomes, researchers did not know whether non-concussive head impacts led to a similar effect.
Recently, the team of researchers found that non-concussive head impacts that did not cause any clinically detectable symptoms in six football players were correlated with changes in the gut microbiome. Their findings, published in PLoS One, offer early clues in identifying gut microbiome-associated biomarkers for assessing the severity of head trauma.

Pelland ZJ, et al. Non-concussive head impacts sustained during American football corr.... PLoS One. 2026;21(5):e0345651.

Comment by Dr. Krishna Kumari Challa on Saturday

A father's obesity affects his children's metabolism

The scientific literature already contains robust evidence that obesity, whether maternal or paternal, can lead to metabolic changes in offspring that increase their risk of developing diseases. A new study published in the journal Nature Communications reveals the mechanism by which this "inheritance" is transmitted to the embryo by the father via the sperm.

Paternal obesity leads to increased levels of let-7 microRNAs in adipose tissue and sperm, which are transferred to the embryo and inhibit DICER enzyme production, causing mitochondrial dysfunction and persistent metabolic impairment in offspring, particularly males. Weight loss in obese fathers normalizes let-7 levels and prevents transmission of these metabolic defects, a finding validated in both mice and humans.

In experiments with mice, the authors observed that the offspring of obese males were born at a normal weight. However, as the days passed, they exhibited glucose intolerance and insulin resistance, which can lead to type 2 diabetes. This condition is called "silent metabolic dysfunction."

The good news is that when the parents lost weight, the "marks" left by obesity in the semen disappeared—a finding that was later validated in human analyses.

Chien Huang et al, Male obesity causes adipose mitochondrial dysfunction in F1 mouse progeny via a let-7-DICER axis, Nature Communications (2026). DOI: 10.1038/s41467-026-69686-5

Comment by Dr. Krishna Kumari Challa on Saturday

The Great Pyramid of Giza has survived 4,500 years of Egyptian earthquakes

The Great Pyramid of Giza in Egypt has survived more than 4,500 years. Earthquakes have repeatedly shaken the region, including the magnitude 5.8 Cairo earthquake in 1992, which dislodged some of the pyramid's outer casing stones. Yet the main body remained essentially intact.

The Great Pyramid of Giza exhibits natural vibration frequencies (2.0–2.6 Hz) distinct from the surrounding soil (0.6 Hz), reducing the risk of resonance during earthquakes. Structural features such as a broad base, low center of mass, and massive masonry contribute to its stability. While these characteristics enhance seismic resilience, there is no direct evidence they were intentionally designed for earthquake resistance.
What the research found
The researchers measured the pyramid's vibrations in ambient conditions. They found that its natural frequencies—the frequencies at which it "prefers" to vibrate—are mostly between about 2.0 and 2.6 hertz (cycles per second). The surrounding soil has a much lower dominant frequency, around 0.6 Hz.

If earthquake shaking matches a structure's natural frequency, the motion can be amplified. This is called resonance, and it can be catastrophic.

The study also reports reduced vibrations near the so-called relieving chambers above the King's Chamber. These chambers are understood to redirect the enormous weight of stone above, and may also affect how vibration energy moves through the pyramid.

These findings suggest some behavior that may be helpful during an earthquake, including a frequency mismatch between the pyramid and the soil. But they do not, by themselves, prove people intentionally built the pyramid to be resilient to earthquakes.
When shaking from an earthquake happens at a frequency that matches a structure's natural frequency, it can cause resonance.

So the measured difference matters. If the ground and the structure vibrate at different rates, the ground is less likely to feed energy efficiently into the structure.

But this addresses only one possible mechanism of earthquake damage. There are plenty of examples of structures performing poorly in earthquakes, even though there was a frequency mismatch to the soil below.
The pyramid may not have been intentionally designed for resilience in an earthquake. But its survival is not an accident, either.

From an engineering point of view, it has many favorable features: a broad base, low center of mass, tapering form, symmetrical plan, competent limestone foundation and massive masonry load path. It is squat, stiff and well-founded rather than tall, slender and flexible.

The safest conclusion is that the builders made excellent empirical engineering choices. Those choices may have been driven by construction experience, observation, structural necessity, or cultural intent. Their seismic benefits may be real without being the original purpose.

The Great Pyramid's survival is not magic, and it is not proof of ancient seismic design.

Mohamed ELGabry et al, Architectural and geotechnical aspects affecting earthquake resilience for the antique Egyptian Khufu pyramid, Scientific Reports (2026). DOI: 10.1038/s41598-026-49962-6

Comment by Dr. Krishna Kumari Challa on Friday

Calcium and vitamin D supplements offer little to no meaningful benefit on fracture, fall prevention, review concludes

Calcium, vitamin D, or combined supplements offer little to no clinically meaningful benefit for fracture and fall prevention in most older people, finds an in-depth review of the latest evidence published by The BMJ.
Calcium, vitamin D, or combined supplementation provides little to no clinically meaningful benefit for preventing fractures or falls in most older adults, based on moderate to high certainty evidence from 69 randomized controlled trials. These findings suggest routine supplementation is not supported for fracture or fall prevention, and recommendations should be re-evaluated.

Calcium, vitamin D, or combined supplementation to prevent fractures and falls: systematic review and meta-analysis, The BMJ (2026). DOI: 10.1136/bmj-2025-088050

Comment by Dr. Krishna Kumari Challa on Friday

The most important finding of the study, however, lies in the reversibility of aging-associated failures: through a targeted increase in phosphatidylcholine levels—for example, via diet.

Tetiana Poliezhaieva et al, Aging-associated decline of phosphatidylcholine synthesis is a malleable trigger of natural mitochondrial aging, Nature Communications (2026). DOI: 10.1038/s41467-026-71508-7

part 2

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