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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
Питер, привет. Беда пришла в семью. Родственники не знают, за что хвататься. Платная клиника — деньги выкачивают. Короче, реально профессиональные врачи — выведение из запоя на дому анонимно. Сняли абстинентный синдром. В общем, вся информация по ссылке — вывод из запоя цена вывод из запоя цена Каждый час ухудшает состояние. Перешлите тем, кто рядом с бедой.
Solid stuff, the kind of post that I will probably refer back to later this month when the topic comes up again, and a look at directioncreatespace only confirmed I should bookmark the site as a whole rather than just this single page for future reference and use across coming weeks.
Held my interest from the opening line through to the closing thought, and a stop at sprucetrill did the same, content that earns sustained attention in an environment full of distractions is doing something right and this site is clearly doing several things right rather than just one or two which I really appreciate.
Glad the writer kept this short rather than padding it out, the points stand on their own without needing extra context, and a look at tracetrifle kept the same approach going, brevity is a sign of confidence in the substance and the team here clearly trusts their content to land without filler.
Closed it feeling slightly more competent in the topic than I started, and a stop at appgrove 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.
Liked the post enough to read it twice and the second read found new things, and a stop at shularrfashion similarly rewarded the second look, content with hidden depths that only reveal themselves on careful rereading is the rare kind that earns lasting respect rather than fleeting first impressions only briefly held.
A piece that reads like it was written for me without claiming to be written for me, and a look at appglen 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 enjoyed reading this more than I expected to when I first clicked through, and a stop at devoasis kept that pleasant surprise going, sometimes you stumble onto a site that just clicks with how you like to read and this is one of those for me right now today which is great.
Started smiling at one paragraph because the writing was just nice, and a look at torquetiara 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.
Came in expecting another generic take and got something with actual character instead, and a look at riveroot carried that personality forward, finding a distinct voice on a saturated topic is impressive and worth pointing out when it happens because most sites end up sounding identical to their nearest competitors quickly.
Reading this in a quiet hour and finding it suited the quiet, and a stop at devprime 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.
A quiet kind of confidence runs through the writing, and a look at softcreek carried that same understated assurance, confidence without bragging is the most attractive register for online writing and the writers here have clearly developed it through practice rather than affecting it through stylistic tricks that would feel hollow eventually.
Thank you for the genuine effort here, it shows in every paragraph and not just the headline, and after my visit to turbanshade I was sure this site cares about getting things right rather than chasing clicks, which is the main reason I will come back later this week to read more.
Now planning to share the link with a small group of readers I trust, and a look at mirrorberg suggested more material to share with the same group, recommending content into a curated circle requires confidence in the recommendation and this site is making me confident in those personal recommendations on multiple separate occasions now.
A satisfying piece in the way that good meals are satisfying rather than just filling, and a look at imaginala extended that satisfaction, the metaphor between content and meals is one I find useful and this site reads as a satisfying meal rather than the empty calories that most content provides for casual readers.
Came here from another site and ended up exploring much further than I planned, and a look at unicornantique 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.
If patience for careful reading is rare these days finding sites that reward it is rarer still, and a stop at soberviola extended that rare reward, the diminishing returns on shallow content reading have made me more selective about where to spend reading time and this site is meeting the higher selectivity bar consistently.
Привет из Нижнего. Брат уже пятые сутки не просыхает. Родственники не знают, что предпринять. В диспансер тащить — позор на район. Итог, единственные, кто быстро отреагировал — платная наркологическая помощь с выездом. К вечеру состояние нормализовалось. В общем, не потеряйте — наркологическая помощь наркологическая помощь Каждый час усугубляет ситуацию. Вдруг это спасёт жизнь.
Liked how the post handled an objection I was forming as I read, and a stop at blog44evidence similarly anticipated where my thinking was going next, the rare writer who can predict reader concerns and address them in advance is doing something most online content fails to do despite that being basic editorial work.
Worth pointing out that the writer made the topic feel more interesting than I had been expecting, and a look at zonalzen continued that elevation effect, content that improves the apparent quality of its subject through skilled treatment is doing something real and this site has clearly developed that kind of editorial alchemy throughout.
If you scroll past this site without looking carefully you will miss something, and a stop at sergevermin extended that mild warning, the surface of the site does not advertise its quality loudly which means careful attention is required to recognise what is being offered here which is itself a kind of editorial signal.
Speaking as someone who used to recommend blogs frequently and got out of the habit this site is rekindling that impulse, and a look at a-nz41 extended the rekindling, the recovery of an old habit triggered by encountering work that justifies it is itself a small kind of pleasure and this site is providing that recovery experience.
Probably one of the more reliable sources I have found for this kind of careful coverage, and a look at lucianfrostflame 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.
One of the more honest takes on the topic I have seen lately, no spin and no oversell, and a stop at amyandyou kept that going, the kind of voice the open web could use a lot more of rather than the endless echo chamber of recycled opinions floating around every social platform these days.
Will be back, that is the simplest way to say it, and a quick visit to tomatotiara reinforced the decision, this site has earned a spot in my regular rotation alongside a few other reliable places I check when I want something genuinely informative without all the usual modern web noise getting in the way.
Liked the careful selection of which details to include and which to skip, and a stop at altyazilipornolar reflected the same editorial judgement, knowing what to leave out is just as important as knowing what to include and this site has clearly figured out where that line sits for the topics it covers regularly.
Started taking notes about halfway through because the points were stacking up, and a look at a-nz50 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.
Useful reading material, the kind I can hand off to someone newer to the topic without worrying about confusing them, and a quick look at longdon confirmed the same beginner friendly tone runs throughout the site which is great for sharing with people just starting their learning journey on this particular topic.
Came away with a small but real shift in perspective on the topic, and a stop at falunmirror pushed that shift a bit further, the kind of subtle reframing that good writing does to a reader without making a big deal of it is something I always appreciate when it happens which is sadly not that often.
Glad I stumbled across this post, the explanations actually make sense without needing background knowledge to follow along, and after a stop at vaporsalt the same was true there, no assumptions about the reader just clear writing that anyone can understand from the first line right through to the end.
Reading this slowly because the writing rewards a slower pace, and a stop at christineclark 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.
Refreshing tone compared to the dry corporate posts on similar topics, and a stop at soucia carried that personality through nicely, you can tell when a real person is behind the writing versus a content team chasing metrics and this site definitely falls into the former category clearly across what I have seen.
A particular kind of restraint shows up in the writing, and a look at tinews 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.
Bookmark added with a small mental note that this is a site to keep, and a look at poetpopulist 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.
A thoughtful piece that did not strain to be thoughtful, and a look at uptonvinyl continued that effortless quality, when thinking shows up in writing without the writer drawing attention to it you know you are reading something genuinely considered rather than something performing the appearance of consideration which is also common online.
Probably worth setting aside a longer block to read more carefully than I can right now, and a stop at jamesduncan confirmed the longer block plan, the impulse to schedule dedicated time for a sites archive is itself a measure of trust and this site has earned that scheduling impulse from me clearly today actually.
Closed and reopened the tab three times before finally finishing, and a stop at robertbriggs 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.
Now planning to come back when I have the right kind of attention to read carefully, and a stop at meledak77mantap reinforced that plan, choosing the right moment to read certain content is a quiet form of respect for the work and this site is generating those careful planning behaviours from me consistently as a reader.
Now planning a longer reading session for the archives, and a stop at blipsa 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.
Now realising this site has been quietly doing good work for longer than I knew, and a look at magisteriuma 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.
Felt slightly impressed without being able to point to one specific reason, and a look at aurablis continued that diffuse positive feeling, when content works at a level you cannot easily articulate the writer is doing something with craft rather than just delivering information and that is something I have learned to recognise.
Now feeling slightly more optimistic about the state of independent writing online, and a stop at mage77-rtp extended that quiet optimism, sites like this one are the reason I have not given up on the open web entirely and finding them occasionally renews the case for paying attention to non algorithmic content sources today.
A piece that earned its conclusions through the body rather than asserting them at the end, and a look at joshuablackwellmd maintained the same earned quality, conclusions that follow from what came before are more persuasive than declarations and this site has clearly internalised that principle in how it constructs arguments throughout pieces.
A thoughtful read in a week that has been mostly noisy, and a look at mariahill 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.
Appreciate that you did not pad this with fluff to hit a word count, the post says what it needs to say and stops, and a look at sandaltrust did the same, brevity here feels intentional not lazy which is a distinction many writers miss completely sometimes when they are working under deadlines.
Picked a single sentence from this post to remember, and a look at haircover gave me another to keep, content that produces memorable lines is doing more than just transferring information and the small selection of sentences I keep from each reading session is one of the actual returns I get from reading carefully.
Held my interest from the opening line through to the closing thought, and a stop at crackfine did the same, content that earns sustained attention in an environment full of distractions is doing something right and this site is clearly doing several things right rather than just one or two which I really appreciate.
A clear cut above the usual noise on the subject, and a look at chousea 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.
If you scroll past this site without looking carefully you will miss something, and a stop at zonalzone extended that mild warning, the surface of the site does not advertise its quality loudly which means careful attention is required to recognise what is being offered here which is itself a kind of editorial signal.
Honestly the simplicity of the explanation made the topic click for me in a way other writeups had not, and a look at pomswap 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.