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Posted: 4 days ago

https://www.science.org/content/article/peacock-feathers-can-be-lasers

Peacocks have a secret hidden in their brightly colored tail feathers: tiny reflective structures that can amplify light into a laser beam. After dyeing the feathers and energizing them with an external light source, researchers discovered they emitted narrow beams of yellow-green laser light. They say the study, published this month in Scientific Reports, offers the first example of a laser cavity in the animal kingdom.

Matjaž Humar, a biophotonics researcher at the University of Ljubljana who recently published a study on edible lasers, calls the study “novel and inspiring.” He says it “is a fascinating and elegant example of how complex biological structures can support the generation of coherent light.”

Lasers are created when a so-called gain medium, often a dye, is “pumped” with energy, which excites the medium’s electrons to higher energy levels. When those electrons fall back to lower energy states, they release their energy by emitting photons of specific wavelengths. Those photons, in turn, can trigger neighboring excited atoms to relax and release photons of their own.

The light is further amplified and ordered into a coherent beam by having it bounce back and forth within a reflective cavity. In a conventional laser, the beam eventually passes through a partial mirror. But in a natural laser, microscopic reflective textures can function as cavities that amplify and release light in different ways.

Scientists have long known that peacock feathers also exhibit “structural color”—nature’s pigment-free way to create dazzling hues. Ordered microstructures within the feathers reflect light at specific frequencies, leading to their vivid blues and greens and iridescence. But Florida Polytechnic University physicist Nathan Dawson and his colleagues wanted to go a step further and see whether those microstructures could also function as a laser cavity.

After staining the feathers with a common dye and pumping them with soft pulses of light, they used laboratory instruments to detect beams of yellow-green laser light that were too faint to see with the naked eye. They emerged from the feathers’ eyespots, at two distinct wavelengths. Surprisingly, differently colored parts of the eyespots emitted the same wavelengths of laser light, even though each region would presumably vary in its microstructure. If this were mere coincidence, it “would be like rolling two 100-sided dice and always getting 74 from one die and 83 from the other,” Dawson says.

Marco Giraldo, a biophysicist at the University of Antioquia who studies structural color, points out that the study does not identify the exact microstructures that are doing the lasing. To explain the consistency of the signal, the cavities throughout the feathers would need to have sizes and shapes that are identical to subnanometer precision. That precludes the hollow parts of the feather, which are too varied, as well as the rod-shaped microstructures known to give peacock feathers their structural color. Dawson hypothesizes that some other distinctive and small structures within the feathers—possibly protein granules—are working as the laser cavity.

Just because peacock feathers emit laser light doesn’t mean the birds are somehow using this emission. But there are still ramifications, Dawson says. He suggests that looking for laser light in biomaterials could help identify arrays of regular microstructures within them. In medicine, for example, certain foreign objects—viruses with distinct geometric shapes, perhaps—could be classified and identified based on their ability to be lasers, he says.

The work also demonstrates how biological materials could one day yield lasers that could be put safely into the human body to emit light for biosensing, medical imaging, and therapeutics. “I always like to think that for many technological achievements that benefit humans,” Dawson says, “some organism somewhere has already developed it through some evolutionary process.”

Edited by satish_2025 - 4 days ago
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Posted: 4 days ago

https://www.parents.com/signs-your-child-is-too-competitive-11778684

11 Signs Your Child Is Too Competitive and What To Do About It

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Posted: 4 days ago

https://www.youtube.com/watch?v=s9R-TnBjLNQ

Baakiyalakshmi | Episode Promo | 29th July 2025

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Posted: 3 days ago
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Posted: 3 days ago

https://www.the-independent.com/life-style/apologies-sorry-british-babbel-b2794507.html?utm_medium=email&utm_source=ten_tabs&utm_campaign=FIREFOX-EDITORIAL-TENTABS-2025_07_29&position=5&category=fascinating_stories&scheduled_corpus_item_id=5a0d30b3-8c3c-4b44-a8c5-d74caf11f079&url=https%3A%2F%2Fwww.the-independent.com%2Flife-style%2Fapologies-sorry-british-babbel-b2794507.html

Why are we so bad at apologising?

For a nation that is famously apologetic about everything, the UK apparently has a hard time saying sorry. Olivia Petter asks why we find making genuine apologies so difficult – and what that says about our ability to take accountability

Saying “sorry” is easy. It’s just one word, two syllables. You can say it faster than you can sneeze. Meaning it, however, is a lot harder. According to research commissioned by the language-learning platform Babbel, Britons have 15 uses for the word, with just one of them meaning regret. So seemingly sorry are we all the time that we don’t even know what it means any more.

Here are some of the ways we’re using “sorry” incorrectly: to ask someone to move out of the way. To ask someone to repeat themselves. To show empathy. To express disbelief. To disagree. To mock. And, if we’re British, to preface literally any sentence ever.

“In British English, ‘sorry’ has evolved beyond its original role as an expression of remorse,” explains Noël Wolf, cultural and linguistic expert at Babbel, whose research also found that we use the word “sorry” an average of nine times a day. “It now serves as a social lubricant and a flexible tool of communication used in all sorts of everyday interactions.”

It also reflects our nationwide desire to avoid conflict by way of old-fashioned, sturdy politeness. We keep calm and carry on, as is the British way. “In a culture where directness can feel impolite, and personal space, both emotional and physical, is protected, ‘sorry’ can smooth over moments of friction, no matter how minor,” says Wolf.

The problem with such an overuse of the word is that it has become diluted beyond recognition, and now we’re unsure how to apologise properly for something that actually warrants remorse. How can any of us truly be sorry if we don’t know how to say it? If we’re saying it too much, does the word even mean anything any more? And why do so many of us resort to insipid platitudes when apologising? Few sentences are more grating to hear than “Sorry if I upset you...”

These are some of the questions asked by Marjorie Ingall and Susan McCarthy in their book Getting to Sorry: The Art of Apology at Work and at Home, which examines the reasons why we might be wired to apologise badly, in both our professional and our personal lives, and why it’s holding us back from having meaningful relationships with others – and with ourselves. A central tenet of their argument relates to the rise of celebrity apologies: public statements made via social media, or representatives, that are designed to enshrine the celebrity’s reputation by minimising bad behaviour. Or occasionally denying it altogether.

We’ve seen this play out countless times in the public eye, with everyone from Drew Barrymore and Lena Dunham to Ashton Kutcher and Mila Kunis issuing statements to address allegations against them. Not to mention Britain’s endless list of terribly sorry politicians. Often, the apologies are long-winded, PR-executed masterpieces. Occasionally, they’re laughably weak and serve as the jumping-off point for an entirely new genre of meme; there are, in fact, several lists compiling the “worst celebrity apologies”.

“They tend to centre the person apologising rather than the people receiving the apology,” says Ingall. “Rarely do they say exactly what they’re apologising for, making them sound fake and like clear attempts to squirm out of trouble rather than a legitimate attempt to make amends.” The result, Ingall posits, is that they set a precedent for apologising badly; for finding every excuse possible to shift the blame and avoid taking accountability, in a bid to protect our reputation – as if we, too, have a globally recognised public image to consider.

“This is because our brains are designed to protect us, to help us see ourselves as the hero of our own story,” explains Ingall. “If we didn’t think we were decent people, it would be hard to get through the day. This means that when we’re faced with the cognitive dissonance of ‘I’m a good person but I did a bad thing’, we tend to fix that uncomfortable dissonance by telling ourselves what we did wasn’t really that awful, that we don’t really have to apologise, and that the other person always overreacts.”

The problem is that the celebrity apology framework has created a consensus whereby apologising is treated as a means to become the hero in a story where you’ve been positioned as a villain. It’s this method of self-protection that has prompted the rise of phrases such as “I’m sorry you feel that way” and “I’m sorry if I hurt you”, or even “I’m sorry if you were hurt.” We use “passive voice and rhetorical dodges to avoid really acknowledging the harm we’ve done and taking responsibility for it”, says Ingall.

There are other reasons why it might be harder for certain individuals to apologise, and that could change depending on where you’re at, emotionally and mentally speaking. “Apologising threatens our sense of identity,” says Dr Jenna Vyas-Lee, a clinical psychologist and co-founder of mental health clinic Kove. “To admit fault often brings up shame, fear of conflict, or defensiveness, especially if we’ve grown up in environments where mistakes were punished or vulnerability was unsafe.”

Power dynamics can further complicate things, as can context; apologising to a boss or a colleague obviously differs significantly from apologising to a partner or a parent. And the way you apologise to friends can also be dependent on the nature of your friendship. “Add cultural norms, like the British preference for understatement, and it’s no wonder people get it wrong,” says Vyas-Lee.

Receiving a weak apology can be frustrating, to say the least. Not only does it tend to downplay whatever has happened to warrant the apology in the first place, but it also creates a feeling of isolation in the person who feels hurt or hard done by – like there’s no sense that the other party understands where they’re coming from, or why they feel wounded.

To admit fault often brings up shame, fear of conflict, or defensiveness, especially if we’ve grown up in environments where mistakes were punished or vulnerability was unsafe

Dr Jenna Vyas-Lee, clinical psychologist and co-founder of mental health clinic Kove

So, what does a good, authentic apology look like? Long and wordy, apparently, at least according to one study this year, which found that people perceive apologies that feature longer words as more genuine. “This is in line with signalling accounts that propose that apologisers should incur a cost (greater production effort) to indicate the sincerity of their apologies,” states the study’s abstract. Elsewhere, research has indicated that the main thing people want from an apology is to feel understood, as well as an acknowledgment of responsibility on the part of the person making it.

“An effective apology has three parts: name the behaviour, acknowledge the impact, and offer repair,” explains Vyas-Lee. “For example: ‘I spoke sharply earlier. I imagine that felt dismissive. I’ll try to speak more thoughtfully next time.’ Keep it specific and genuine; avoid hedging words like ‘if’ or ‘but’.” It can also be helpful to extend an apology beyond a single moment. It’s not as simple as saying “sorry”, even with all the right rhetorical paraphernalia attached to it, and moving on. An apology has to be extended if it’s going to be meaningful.

“A day or two later, check in with the person,” suggests Gemma Logan, relationship and friendship expert at The Brighton Bucket List. “Say something like, ‘I’ve been thinking about what I said, and I still feel bad about how I handled that. I want you to know I’m taking it seriously.’ It shows lasting care and respect.”

Whichever way you spin it, there is no excuse for giving a bad apology – particularly not as a fully fledged, emotionally mature adult. But if you’ve been the donor of one (or two) in the past, at least now you know what not to do to make things right. Sorry, hope that’s clear.

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Posted: 2 days ago

https://www.youtube.com/watch?v=U-GygEvDAHc

Baakiyalakshmi | Episode Promo | 30th July 2025

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Posted: 2 days ago


THIS IS A "MEMBERS ONLY" POST
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Posted: 2 days ago

https://www.youtube.com/watch?v=nrqS0pcZ6ms

Baakiyalakshmi | Episode Promo | 31st July 2025

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