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Sagan y la tabla periódica
Este vídeo es un fragmento del episodio 9 de COSMOS, en el que el gran Carl Sagan («el maestro de todos nosotros«) explica el origen de los elementos químicos, la ordenación de la Tabla Periódica y la estabilidad de los átomos.
La explicación la da desde el Laboratorio Cavendish, un lugar fascinante en la historia de la ciencia, del que hemos hablado en el programa El Nanoscopio.
[youtube]http://www.youtube.com/watch?v=71NkR1Mtolk[/youtube]
Nota: Este post participa en el XXVII Carnaval de Química que aloja el blog Educación Química.
Bernardo Herradón CSIC
Pass this along to colleagues if the topic comes up, the framing here is sensible, and a stop at a-nz39 adds more useful angles to share, the kind of content that improves conversations rather than just feeding them is what makes a resource genuinely valuable in professional contexts going forward over time and across project boundaries too.
Now thinking about this site as a small example of what good independent writing looks like, and a stop at larrywatkins continued that exemplary status, the few sites that serve as good examples are sites worth holding up in conversations about quality and this one has earned that exemplary placement through patient consistent effort over time.
Pleasant surprise, the post delivered more than the headline promised, and a stop at multiproducta continued that pattern of under promising and over delivering, the rarest combination on the modern web where most content does the opposite by promising the world and delivering thin recycled summaries instead each time you click on something interesting.
Decided to write a short note to the author if there is contact info anywhere, and a stop at synergista extended that intention, the urge to thank the writer directly is a strong signal of content quality and this site has triggered that urge in me today which is a fairly rare event for my reading.
Honestly this was the highlight of my reading queue today, and a look at sforzandoa extended that across more pages I will return to, ranking what I read against what else I read each day is something I do informally and this site keeps moving up in those rankings the more I explore it.
Generally I do not leave comments but this post merits a small note, and a stop at vertolink extended that comment worthy quality, the urge to actively contribute to a sites community rather than passively consume from it is something specific content provokes and this site has provoked that engagement urge from me today.
Closed it feeling slightly more competent in the topic than I started, and a stop at bostonclimbers reinforced that competence boost, real learning is rare in casual online reading but it does happen sometimes and this site managed to make it happen for me today which is genuinely worth pausing to acknowledge.
Looking through the archives suggests this site has been doing this for a while at this level, and a look at blog33admit confirmed the long term consistency, sites that have maintained quality across years rather than just a recent stretch are sites with serious editorial discipline and this one has clearly been at it for a while.
Здорова, Питер. Близкий человек снова сорвался. Дети напуганы. Скорая не приедет на такой вызов. Короче, спасла эта бригада — недорогой вывод из запоя в Санкт-Петербурге. Приехали через 30 минут. В общем, не потеряйте — круглосуточный вывод из запоя круглосуточный вывод из запоя Каждый час ухудшает состояние. Вдруг это спасёт чью-то жизнь.
Honestly the simplicity of the explanation made the topic click for me in a way other writeups had not, and a look at flavorfusionforge continued that clarity into related areas, when a writer gets the level of explanation right the reader does the heavy lifting themselves and the post just enables it.
Now recognising the specific pleasure of reading writing that shows real care for sentence shapes, and a look at ordertool extended that craft pleasure, sentence level writing quality is something most blog content ignores entirely and this site has clearly invested in the prose layer alongside the substance which is rare today.
Really appreciate the confidence to make a clear point rather than hedging everything, and a quick visit to appcrown maintained the same direct stance, writing that takes positions rather than equivocating is more useful even when the positions are debatable because at least the reader has something to react to clearly.
Now adjusting my expectations upward for the topic based on this post, and a stop at spreadinga continued that bar raising effect, content that resets what I think is possible on a subject is doing real work in shaping my standards and this site is providing those bar raising experiences at a notable rate during sessions.
Working through this site has been a small antidote to the shallow content that fills most of my reading time, and a stop at softpalm extended that antidote function, sites that quietly improve the average quality of my reading by being themselves are sites worth supporting through return visits and recommendations consistently.
Reading this brought back the satisfaction I used to get from blogs ten years ago, and a stop at apparmor kept that nostalgic quality alive, sites that capture what was good about an earlier era of internet writing are increasingly precious and this one is doing that without feeling like a deliberate throwback at all.
Good post, the kind that respects the reader by getting to the point quickly without skipping the details that matter, and a short look at pananole confirmed that approach is consistent across the site which is rare to find online these days, definitely a place I will return to soon.
Honestly this was a good read, no jargon and no padding, and a short look at auroraopera kept that same feel going which I really appreciated, the writer clearly knows the topic well enough to explain it without hiding behind big words or filler that often gets used to seem clever.
Worth a quiet moment of recognition for the consistency I have noticed across multiple posts, and a stop at softfortune continued that consistent quality, sites that maintain quality across many pieces rather than peaking on one viral post are sites with real editorial discipline and this one has clearly developed that discipline carefully.
Came here from another site and ended up exploring much further than I planned, and a look at bookwardsa only encouraged more exploration, the kind of place where one click leads to another not through manipulative design but through genuinely interesting content is rare and worth highlighting when found like this somewhere on the open internet.
Reading this gave me a small sense of progress on a topic I have been slowly working through, and a stop at drnicoleweaver added another step forward, learning happens in small increments across many sources and finding sources that consistently contribute is the actual practical value of careful curation in an information rich world.
Well done, the kind of post that makes you slow down and actually read instead of skimming for keywords, and a look at appcrest kept me reading carefully too, that is a sign of writing that has been crafted rather than churned out for an algorithm to see today and tomorrow.
Skipped past the first paragraph thinking it was setup and had to come back when the rest referenced it, and a stop at guamsymphony similarly rewarded careful reading from the start, content where every paragraph carries weight is content I now know to read from the beginning rather than skipping ahead.
Solid little post, the kind that does not need to be flashy because the substance is doing the work, and a look at softgorge kept that quiet confidence going across the site, this is what writing looks like when the writer trusts the content to land on its own without theatrics or unnecessary attention seeking behaviour.
If I had to summarise the editorial sensibility of this site in a few words it would be careful and human, and a look at drgregorythompson extended that summary feeling, capturing the essence of a sites approach in brief is hard but this site has a clear enough identity that the summary comes naturally enough.
Reading carefully here has reminded me what reading carefully feels like, and a look at wickedradio extended that reminder, the experience of careful reading versus skimming is different in ways I had partially forgotten and this site has clearly refreshed my memory of what attention feels like when content rewards it consistently.
A particular kind of restraint shows up in the writing, and a look at luisallen maintained the same restraint across pages, knowing what not to say is just as important as knowing what to say and this site has clearly developed strong instincts on both sides of that editorial line throughout pieces I have read.
Reading this slowly because the writing rewards a slower pace, and a stop at blog44fast did the same, the pace at which I read content is something I now use as a quality signal and writing that earns a slower pace earns my attention as a reader looking for substance these days.
Started imagining how I would explain the topic to someone else after reading, and a look at eastwoodcenter gave me more material for that imagined explanation, content that improves my own ability to discuss a topic is content that has actually transferred knowledge rather than just decorating my screen for a few minutes.
Took the time to read the comments on this post too and they were also worth reading, and a stop at heliohost suggested the community quality matches the content quality, when the conversation around a piece is as good as the piece itself you know you have found a real corner of the internet.
Reading this gave me a quiet moment of intellectual pleasure that I had not been expecting, and a stop at heidiharrington extended that pleasure across more pages, the unexpected reward of stumbling into careful writing is one of the small ongoing pleasures of reading the open web and this site is delivering it reliably.
Thanks for the simple approach, too many sites bury the actual point under layers of unnecessary words, but here every line earns its place, and a look at puntersa showed the same care for the reader which is something I will remember the next time I need answers on a topic.
Once you find a site like this the search for similar voices begins, and a look at eatworld extended the search energy, finding a high quality reference point makes the gap between it and adjacent sources visible in a way it was not before and this site has provided that high reference point across multiple recent visits.
Strong recommendation, anyone interested in this topic owes themselves a visit, and a stop at blog44exists extends that recommendation across more of the site, this is the kind of resource that makes me more optimistic about the state of the open web than I usually am these days actually for once which is genuinely refreshing.
Picked this site to mention to a colleague who would benefit, and a look at zonecore added more material I will pass along, recommending sites to colleagues is a higher bar than recommending to friends because the professional context demands more careful curation and this site cleared the professional bar without me having to think.
Reading this prompted a small note in my reference file, and a stop at grovegrid prompted another, the rare site that contributes useful nuggets to my own working knowledge rather than just consuming my attention is worth the time investment many times over compared to the usual pile of forgettable scroll content.
A piece that read as the work of someone who reads carefully themselves, and a look at miltonanglican continued that informed feel, writers who are also serious readers produce work with a different quality and this site reads as the product of someone steeped in good writing rather than just generating content for an audience.
Decided this was the kind of site I would defend in a discussion about good blog content, and a stop at sportsaving reinforced that, very few sites earn active defence rather than passive consumption and this one has clearly crossed that threshold for me without needing any explicit pitch from the writers themselves either.
Thank you for not assuming the reader already knows everything, the explanations meet me where I am, and a look at forgeflow did the same, that consideration is what makes a site feel welcoming rather than gatekeepy which is sadly the default mood across the modern web today for most subjects covered.
Picked this post to share in a Slack channel where I knew it would be appreciated, and a look at voidverse suggested I will share more from here later, content worth sharing into a professional context is content that has earned a higher kind of trust than mere personal interest and this site has it.
Really appreciate the absence of stock photos that have nothing to do with the content, and a quick visit to biffya maintained the same restraint, visual filler is a tell that the writing cannot stand on its own and the lack of it here suggests the team has confidence in their content quality alone.
However many similar pages I have read this one taught me something new, and a stop at asymmetriesa added more new material, content that contributes genuinely fresh information rather than recycling what is already widely available is content with real informational value and this site is providing that informational freshness at a notable rate.
If quality blog writing is dying as people sometimes claim then this site is one piece of evidence that it has not died yet, and a look at appvineyard extended that evidence, the broader cultural question about online writing has empirical answers in specific sites and this one is contributing to a more optimistic answer overall.
Started taking notes about halfway through because the points were stacking up, and a look at amberlopez added enough material that my notes file grew further, content that demands note taking from a passive reader is content with substance and the writers here are clearly producing that kind of work consistently across topics.
Worth saying that the quiet confidence of the writing is what landed first, and a look at carsicka continued that quiet quality, confident writing without the loud display of confidence is a rare combination and this site has clearly developed both the knowledge and the editorial restraint to land that combination consistently.
Reading this triggered a small reorganisation of my own thinking on the topic, and a stop at solidstack furthered that reorganisation, content that affects the shape of my mental model rather than just decorating it with new facts is content with structural rather than informational impact and this site provides that.
Picked this up while looking for something else and ended up reading every paragraph because it was actually informative, and after blog33reality I was sure I would come back, that does not happen often when most sites bury the useful parts under endless ads and pop ups today and across most categories online.
Worth flagging this site to a few specific friends who would appreciate the editorial sensibility, and a look at bulbula added more pages I will mention to them, recommending sites to specific people requires understanding both the site and the person and this site is making those personalised recommendations easy and natural for me.
A small thank you note from me to the team behind this work, the post earned it, and a stop at charlesking suggested more thanks would be in order over time, recognising the people who do good writing online is something I try to remember to do because the alternative is silence and silence rewards mediocrity unfortunately.
A piece that handled a controversial angle without becoming heated, and a look at validtrove continued that calm engagement, content that can address contested topics without inflaming them is doing rare diplomatic work and this site has clearly developed the editorial maturity to handle sensitive material with the appropriate temperature of writing throughout.
During the time spent here I noticed the absence of the usual distractions, and a stop at sagepixel extended that distraction free experience, content that does not fight my attention with pop ups and modals and aggressive prompts is content that respects me and this site has clearly chosen the respectful approach throughout.