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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
Quality writing that respects the reader’s intelligence without overloading them, and a quick look at longtermtrustnetwork reflected that approach, a balanced thoughtful site that earns trust by being consistent rather than by shouting about how trustworthy it is which is the usual approach online sadly across most content categories.
Glad I clicked through from where I did because this turned out to be worth the time spent, and after claritybuilderhub I had a fuller picture, the kind of content that earns its visitors through delivering value rather than chasing them through aggressive advertising or constant pop ups appearing everywhere on the screen lately.
A piece that reads like it was written for me without claiming to be written for me, and a look at directionchannelsprogress produced the same fit, when the writer audience match clicks naturally without being engineered through demographic targeting you know the writing is solid and this site has that natural fit consistently for me.
Honestly slowed down to read this carefully which is not my default, and a look at growthflowswithclarity kept me in that careful reading mode, the kind of writing that demands attention by being worth attention is rare in a media environment full of content engineered to be skimmed not read with any real focus today.
Bookmark earned, share earned, return visit earned, all from one reading session, and a look at directionalprocess did the same, the trifecta of bookmark and share and return is rare in a single visit and represents the highest level of engagement I tend to offer any piece of online content these days here.
Reading this prompted me to send the link to two different people for two different reasons, and a stop at focusbuildsresults provided ammunition for a third share, content that suits multiple audiences without being generic enough to be useless to any of them is genuinely valuable and this site has that multi audience quality clearly.
Came here from a search and stayed for the side links because they were that interesting, and a stop at actionmomentum took me even further into the site, the kind of organic exploration that good content invites is something most sites kill through aggressive interlinking and pushy navigation choices rather than relying on quality.
Just want to recognise that someone clearly cared about how this turned out, and a look at growthmoveswithstructure confirmed that care extends across the broader site, you can feel the difference between content shipped to hit a deadline and content released because the writer was actually proud of the result for once.
Worth saying that the quiet confidence of the writing is what landed first, and a look at actionconstructor 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.
Bookmark added with a small mental note that this is a site to keep, and a look at unitytrustbond reinforced the keep status, the verb keep rather than visit captures something about how I think about this kind of site and it is a higher tier of relationship than I have with most places online today.
Quietly enjoying that I have found a new site to follow for the topic, and a look at focusguidesmovement reinforced the small pleasure of the find, the discovery of new high quality sources is one of the more durable pleasures of careful internet reading and this site has been generating that discovery pleasure at multiple points already today.
Halfway through I knew I would finish the post, and a stop at bondedstability also held me through to the end, content that signals its quality early and then sustains it is content with real internal consistency and this site has clearly figured out how to maintain quality from opening sentence through to closing thought.
Reading this in segments because the day was busy, and the post survived the fragmented attention well, and a stop at actioncreatesforwardpath held up similarly under interrupted reading, content that can withstand modern distracted reading patterns rather than requiring a perfect block of focused time is increasingly the kind I prefer.
Now appreciating that I did not feel exhausted after reading, and a stop at collaborativepowergroup extended that energising quality, content that leaves me with more attention than it consumed is rare and the gap between draining and energising content is real over the course of a typical day spent reading widely online.
Pleasant surprise, the post delivered more than the headline promised, and a stop at momentumplanning 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.
Just want to say thank you for putting this together, posts like these make searching online actually worth it sometimes, and a quick look at strongalliancelink kept that going, useful and easy to read without any of the tricks that ruin most blog comment sections lately on the wider open web.
Granted I am giving this site more credit than I usually give new finds, and a look at claritysystems continued earning that credit, the calibration of how much trust to extend after limited exposure is something I do carefully and this site has earned more trust on shorter exposure than most due to consistent quality across.
Started smiling at one paragraph because the writing was just nice, and a look at businessbondcircle produced a couple more such moments, prose that produces small spontaneous reactions in the reader is doing more than just transferring information and the writers here are clearly hitting that level fairly consistently throughout pieces.
Reading this in a relaxed evening setting was a small pleasure, and a stop at actionmovesstrategy extended the pleasant evening reading, content that fits the tone of relaxed time without becoming forgettable is what I look for in evening reading and this site has the right tone for that particular slot in my daily reading routine.
A well calibrated piece that knew its scope and stayed inside it, and a look at growtharchitect maintained the same scope discipline, scope creep is one of the failure modes of long blog posts and this site has clearly invested in the editorial discipline to prevent it which shows up in tightly contained pieces.
Thanks again for the post, I learned a couple of things I can actually use later this week, and after I went over momentumactivation the rest of the site looked equally promising, definitely going to spend more time here when I get a free moment over the weekend to read more carefully.
If I had encountered this site five years ago I would have been telling everyone about it, and a look at businessunitynetwork extended that retrospective enthusiasm, the version of me who used to recommend favourite blogs frequently would have made sure friends knew about this one and that earlier enthusiasm is partially returning to me here.
Closed several other tabs to focus on this one as I read, and a stop at progressflowswithclarity held my undivided attention the same way, content that earns full focus in an attention environment full of competing pulls is content doing something genuinely well and the team behind it deserves recognition for that achievement consistently.
Bookmark earned and the bookmark feels like a permanent addition rather than a maybe, and a look at actioncreatespathways confirmed that permanent status, the difference between durable bookmarks and ephemeral ones is something I have learned to feel quickly and this site triggered the durable feeling almost immediately during my first read here.
A piece that was confident enough to leave some questions open rather than forcing closure, and a look at forwardpathway continued that intellectual honesty, content that admits the limits of its scope is more trustworthy than content that pretends to total understanding and this site has the right calibration on certainty consistently.
Looking forward to seeing what gets published next month, and a look at claritymotionlab extended that anticipation across the broader site, finding myself looking forward to a sites future content rather than just consuming its existing content is a stronger commitment level than I usually reach with new finds and this site triggered that.
Reading this in a quiet hour and finding it suited the quiet, and a stop at signalshapesprogress extended the quiet reading mood, content that matches its own optimal reading conditions rather than fighting them is content that has been thoughtfully calibrated and this site reads as having a particular reading mood in mind throughout.
Came back to this an hour later to reread a specific section, and a quick visit to truebondnetwork also drew a second look, content that pulls you back rather than letting you move on permanently is the kind I want to fill my browser bookmarks with in 2026 and beyond as the open internet evolves.
Solid little post, the kind that does not need to be flashy because the substance is doing the work, and a look at claritycreatesprogress 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.
Started smiling at one paragraph because the writing was just nice, and a look at bondedcollective produced a couple more such moments, prose that produces small spontaneous reactions in the reader is doing more than just transferring information and the writers here are clearly hitting that level fairly consistently throughout pieces.
Adding to the bookmarks now before I forget, that is how good this is, and a look at signalcreatesdirectionalflow confirmed the rest of the site is worth saving too, this is one of those rare finds that justifies the time spent searching the web for once which is a relief in the current environment.
Closed the laptop after this and let the ideas settle for a few hours, and a stop at claritylane similarly rewarded reflective time, content that benefits from sitting with rather than racing past is the kind I want more of and the kind that this site appears to consistently produce week after week here.
A piece that ended with a clean landing rather than fading out, and a look at ideaexecutionhub maintained the same crisp conclusions, endings that resolve rather than dissolve are a sign of careful structural thinking and this site has clearly invested in how its pieces conclude rather than letting them simply run out of energy.
During my morning reading slot this fit perfectly into the routine, and a look at directionanchorsmotion extended that perfect fit into the rest of the routine, content that matches the rhythm of how I actually read rather than demanding accommodation from my schedule is content well calibrated to its likely audience and this site has it.
Reading this with a notebook open turned out to be the right move, and a stop at forwardpathconstructed added more material to the notes, content that justifies active note taking from a passive reader is content with real informational density and this site is producing notes worthy material at a high rate consistently.
Really appreciate that the writer did not assume I would read every other related post first, and a look at trustedrelationshipnet kept that self contained feel going where each piece can stand alone, accessibility for new readers is a sign of generous editorial thinking and this site has clearly invested in that approach.
Reading this slowly and letting each paragraph land before moving on, and a stop at growthlogic earned the same patient approach, content that rewards slow reading rather than speed is content with real density and the writers here are clearly producing work that benefits from the careful eye rather than the rushed scan.
Reading this in three sittings because the day was fragmented, and the piece survived the fragmentation, and a stop at progressengineered held up under similar reading conditions, content engineered for continuous attention is fragile in modern conditions and this site reads as durable across the realistic ways people consume content today.
However casually I came to this site I have ended up reading carefully, and a look at visionarybondcircle continued earning that careful reading, the conversion from casual visitor to careful reader is something content earns rather than demands and this site has accomplished that conversion for me over the course of just a few pieces.
Came across this through a roundabout path and now it is on my regular rotation, and a stop at ideaconverter sealed that decision, the open web still produces serendipitous discoveries when you let the citations and references guide you rather than relying purely on algorithmic feeds for new content recommendations always.
Will be passing this along to a few people who would benefit from the perspective shared here, and a stop at futuregrowthalliance only added to what I will be sharing, this kind of generous content deserves to circulate widely rather than getting buried in some search engine algorithm tweak that pushes it down the rankings.
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 ideasgainalignment confirmed that approach is consistent across the site which is rare to find online these days, definitely a place I will return to soon.
Reading carefully this time rather than scanning, and the depth shows up in places I missed first time around, and a look at strategyactivation rewarded the same careful approach, content that holds up to multiple reads is content I want more of in my regular rotation rather than disposable scroll fodder daily.
Adding this to my list of go to references for the topic, and a stop at focuscreatesdirection confirmed the rest of the site deserves the same, definitely the kind of resource that earns its place rather than getting forgotten the moment the next interesting article shows up in my feed somewhere else on the web.
Generally I bookmark sparingly to avoid building up a bookmark graveyard but this one earned a permanent slot, and a stop at progressmoveswithdesign extended that permanence designation, the few sites I keep permanent bookmarks for are sites I expect to use repeatedly and this one has clearly cleared that expectation bar today.
Considered alongside other sources I have been reading this one consistently rises to the top, and a stop at directionalplanninglab maintained that top ranking, the informal ongoing comparison between sources is something I do whenever reading on a topic and this site keeps coming out near the top of those comparisons over many sessions.
Felt the post had been written without looking over its shoulder, and a look at growthoriented continued that confident posture, content written for its own sake rather than against imagined critics has a different quality and this site reads as written from a place of confidence rather than defensive justification of every claim.
A clear cut above the usual noise on the subject, and a look at bondedendurance only made that gap wider in my view, the kind of place that earns its visitors through quality rather than through aggressive marketing or sponsored placements which is increasingly the only way most sites stay afloat across the modern web.
Picked this for my morning read because the topic seemed worth the time, and a look at businesssynergyhub confirmed the choice was right, my morning reading slot is precious and giving it to this site felt like a good investment rather than a waste which is a higher endorsement than I usually offer for content.
Bookmark earned, calendar reminder set, share queued, all from one good post, and a look at capitalbondcircle did the same, when a single reading session triggers multiple downstream actions you know the content has actually moved me beyond the page and this site is moving me at that higher level reliably.