Sagan y la tabla periódica

Este vídeo es un fragmento del episodio 9 de COSMOS, en el que el gran Carl Saganel 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
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778 comentarios

  1. Liked that there was nothing performative about the writing, and a stop at focusmapping continued that genuine quality, performative writing tries to be witnessed rather than read and the difference between performance and substance is huge for the careful reader and this site has clearly chosen substance every time clearly.

  2. Picked a friend mentally as the audience for this and decided to send the link, and a look at bondedprinciples confirmed the send was the right choice, choosing whom to share content with is a small act of curation that I take more seriously than the public sharing most platforms encourage these days online.

  3. Refreshing to find writing that does not try to manipulate the reader into clicking onto the next page through cliffhangers and forced engagement, and a stop at forwardmotionactivatednow continued in the same respectful way, this is what reader first design actually looks like in practice rather than just in marketing copy that sounds nice.

  4. Reading carefully this time rather than scanning, and the depth shows up in places I missed first time around, and a look at forwardmotionstructure 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.

  5. Now setting this aside as a model of how to write thoughtfully on the topic, and a stop at ideaconversion extended that model status, content that becomes a reference for how a kind of writing should be done is content with influence beyond its own readership and this site is reaching that level for me clearly today.

  6. Honestly impressed, did not expect to find this level of care on the topic, and a stop at focuspowersprogress cemented the impression, you can tell within the first few paragraphs whether a site is going to be worth the time and this one delivered on that early promise nicely throughout the rest of what I read.

  7. A quiet piece that did not try to compete on volume, and a look at unitedsuccesscircle maintained that selective approach, sites that publish less but better are increasingly rare in an environment that rewards volume and this one has clearly chosen quality cadence over quantity which is a brave editorial decision in current conditions.

  8. Skipped the comments to avoid spoilers and came back later to find them genuinely worth reading, and a stop at claritysystem extended that surprised respect, when the discussion below a post matches the quality of the post itself you have found something special and this site appears to attract that kind of audience.

  9. I came here looking for a quick answer and ended up reading the whole post because it was actually interesting, and after actionorchestration I had a much fuller picture, no stress and no confusion just a clear walk through the topic that made everything fall into place without much effort.

  10. Closed and reopened the tab three times before finally finishing, and a stop at clarityexecution held my attention straight through, sometimes content fights for time against my own distraction and the times it wins say something positive about its quality and this post clearly won that fight today afternoon for me.

  11. A thoughtful read in a week that has been mostly noisy, and a look at growthtrustcircle carried that thoughtful quality across more pages, finding pockets of considered writing in a week of distractions is one of the small wins of careful curation and this site is providing those pockets at a sustainable rate.

  12. A slim post with substantial content per word, and a look at longviewalliance maintained the same density, the content per word ratio is something I track informally and this site scores high on that ratio compared to most sources I read regularly which is a quiet indicator of careful editorial work behind the scenes.

  13. Now recognising that the post handled the topic with appropriate technical precision without becoming dry, and a stop at directionactivatesmotion continued that balance, technical precision and readability are often in tension and this site has clearly figured out how to maintain both at once which is one of the harder editorial achievements in the form.

  14. Just nice to read something that does not feel like it was assembled from a content brief, and a stop at growthvector kept that handcrafted feel going, you can tell when a real human with real understanding is behind the words versus a templated piece churned out for an algorithm to find.

  15. Just one of those reads that left me feeling slightly more capable rather than overwhelmed, and a look at solidbondgroup kept that empowering feel going, the difference between content that builds the reader up and content that intimidates them is huge and this site clearly knows which side of that line to stand.

  16. Skimmed first and then went back to read carefully, and the careful read paid off in places I had missed, and a stop at claritycompanion got the same treatment, the rare site whose content rewards a second pass is content I want more of in my regular rotation rather than disposable single read articles.

  17. Probably one of the more reliable sources I have found for this kind of careful coverage, and a look at actiondrivesmomentum reinforced the reliability, the small group of sources I would describe as reliable for a given topic is curated carefully and this site has earned a place in that small group through consistent performance.

  18. Reading this in segments because the day was busy, and the post survived the fragmented attention well, and a stop at ideasunlockmotion 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.

  19. A well calibrated piece that knew its scope and stayed inside it, and a look at nextstepnavigator 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.

  20. Skipped the comments section but might come back to read it, and a stop at ideasdrivevelocity hinted at a quality reader community, sites where the comments are worth reading separately from the post are increasingly rare and signal a particular kind of audience that has grown around the editorial vision over time gradually.

  21. Started thinking about my own writing differently after reading, and a look at heritagecapitalbond continued that reflective effect, content that influences how I work rather than just informing what I know is content with the highest kind of impact and this site has triggered some of that reflective influence today on me.

  22. Really like that there are no exclamation marks or all caps shouting throughout the post, and a quick visit to ideasunlockgrowth maintained the same calm voice, restraint in punctuation signals confidence in the content and this site clearly trusts its substance to do the persuading rather than relying on typographic emphasis.

  23. During a reading session that included several other sources this one stood out, and a look at strategyplanner continued the standout quality, the side by side comparison of sources during research is a useful exercise and this site has been winning those comparisons for me consistently across multiple research sessions during the last week.

  24. Honestly slowed down to read this carefully which is not my default, and a look at progressmomentum 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.

  25. Liked the balance between depth and brevity, never too shallow and never too long, and a stop at clarityanchorsmotion kept the same balance going across the rest of the site, this is one of the harder skills in writing and the team here clearly has it figured out very well indeed across every page.

  26. Saving this link for the next time someone asks me about this topic, and a look at signaldrivesclarity expanded what I will be sharing with them, this is the kind of resource that makes a real difference when you are trying to point a friend to something useful and reliable rather than generic marketing pages.

  27. Comfortable reading experience throughout, no jarring tone shifts and no awkward formatting, and a look at strategicalliancelink kept that smooth feel going, the kind of editorial polish that goes unnoticed when present but glaring when absent is something this site has clearly invested in across the broader content as well which deserves recognition.

  28. Easy to recommend, the content speaks for itself without needing additional praise from me, and a stop at progressmovesintelligently only adds more reasons to send people this way, the kind of generous resource that benefits its readers without demanding anything in return is increasingly rare and worth recognising clearly today across the broader open internet.

  29. The conclusions felt earned rather than tacked on at the end like an afterthought, and a look at momentumbuildsforward kept that careful structure going, you can tell when a writer has thought about the shape of their post versus just letting it ramble out and hoping for the best at the end which most do.

  30. Decided to write a short note to the author if there is contact info anywhere, and a stop at forwardmomentumhub 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.

  31. Now wishing more sites covered topics with this level of care, and a look at forwardprogression extended that wish across more subjects, the rarity of careful coverage on most topics is a problem and this site is one of the small antidotes to that broader pattern of casual or surface treatment of complex subjects.

  32. Just sat with this for a bit longer than I usually would because the points are worth thinking about, and after progressmoveswithsignal I had even more to chew on, the kind of post that nudges your thinking forward without forcing the issue is something I have always appreciated in good writing online.

  33. Just wanted to drop a quick note saying this was a useful read on a topic I have been circling, no fluff, and a stop at actionmapping added a few extra points that fit the same simple style which makes the whole site feel coherent rather than thrown together by many different writers with different goals.

  34. Even just sampling a few posts the consistency is what stands out, and a look at bondedpathway confirmed the broader pattern, sites where every piece I sample lives up to the standard set by the others are sites with serious quality control and this one has clearly invested in whatever editorial process produces that consistency reliably.

  35. Adding to the bookmarks now before I forget, that is how good this is, and a look at strongbusinessalliance 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.

  36. Glad the writer did not feel compelled to cover every possible angle of the topic, focus is a virtue, and a stop at globalpartnerbond reflected the same disciplined scope, knowing what to leave out is half of what makes good writing good and this post has clearly been edited with that principle in mind.

  37. A piece that did not waste any of its substance on sales or promotion, and a look at foundationalliancebond continued that pure content focus, sites that resist the urge to monetise every paragraph are increasingly rare and this one has clearly made the editorial choice to keep the writing clean from commercial intrusion which I value highly.

  38. Bookmark added with a small note about why, and a look at forwardmotionclarity prompted another bookmark with another note, the bookmarks I annotate are the ones I expect to return to deliberately rather than stumble into and this site is generating annotated bookmarks at a higher rate than my usual content sources by some margin.

  39. A piece that did not lecture even when it had clear positions, and a look at ideasintomotion maintained the same teaching without preaching tone, finding the line between informing and lecturing is hard and most sites land on the wrong side of it but this one has clearly figured out how to inform without becoming preachy.

  40. Speaking as someone who reads a lot on this topic this site has earned a high position in my source rankings, and a stop at legacytrustgroup reinforced that ranking, the informal ranking of sources for a topic is something I maintain mentally and this site has moved into the upper portion of those rankings clearly.

  41. Got something practical out of this that I can apply later this week, and a stop at actionmatrix added more details to think about, this is exactly the kind of content I bookmark for future reference rather than the throwaway listicles that dominate most search results these days for almost any common topic.

  42. Now planning a longer reading session for the archives, and a stop at focusvector confirmed the archives are worth that longer commitment, sites with archives I want to read deliberately rather than just sample are rare and this one has clearly earned that level of interest based on the consistency of what I have already read.

  43. Now recognising that the post handled the topic with appropriate technical precision without becoming dry, and a stop at directionactivatesprogress continued that balance, technical precision and readability are often in tension and this site has clearly figured out how to maintain both at once which is one of the harder editorial achievements in the form.

  44. Worth saying this site reads better than most paid newsletters I have tried, and a stop at progressmovesnaturally confirmed that comparison, the bar for free content is often lower than for paid but this site clears the paid bar consistently and that says something about the editorial approach behind the work being published here regularly.

  45. Thanks for the breakdown, it gave me a clearer picture of something I had been confused about for a while now, and a stop at intentionalmomentum closed the remaining gaps in my understanding nicely, no need to hunt around twenty other articles to put the pieces together which is a real time saver.

  46. Reading this back to back with a similar piece elsewhere made the quality difference obvious, and a stop at growthorientedbond only widened the gap, comparing content side by side is a useful exercise and the gap between this site and average competitors in the space is large enough to be noticeable from the first paragraph.

  47. If I had encountered this site five years ago I would have been telling everyone about it, and a look at ideaclarity 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.

  48. Ended up here on a wandering afternoon and was glad I stayed for the read, and a stop at ideasflowwithintent extended the wandering into a proper exploration of the site, the kind of place that rewards aimless clicking with something genuinely interesting rather than the shallow content that mostly populates the modern open web.

  49. Bookmark earned and the bookmark feels like a permanent addition rather than a maybe, and a look at progresswithclearintent 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.

  50. Now realising this site has been quietly doing good work for longer than I knew, and a look at actioncreatesmomentumflow suggested an archive worth exploring, sites with deep archives of consistent quality represent a different kind of resource than sites with viral hits and this one looks like the durable kind based on what I see.

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