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Posts posted by Sensei

  1. Actually it is possible..


    "Johns Hopkins Researchers Return Blood Cells to Stem Cell State. Johns Hopkins scientists have developed a reliable method to turn the clock back on blood cells, restoring them to a primitive stem cell state from which they can then develop into any other type of cell in the body. The work, described in the Aug.Aug 21, 2012"



    1 hour ago, Hans de Vries said:

    What happens?

    Primitive religious fanatical priests will stop complaining that human embryos are used to get stem cells.. ?

    (Every day, men's seeds, and every month women's eggs end up in toilets and trashcans inside of sanitary napkin, tampons etc. ... being used to save someone's life is a better solution than trashcan)


    "Embryonic stem cells (ESCs) are stem cells derived from the undifferentiated inner mass cells of a human embryo. Embryonic stem cells are pluripotent, meaning they are able to grow (i.e. differentiate) into all derivatives of the three primary germ layers: ectoderm, endoderm and mesoderm."


  2. A small correction, regardless of GR or Newtonian's gravity, object is attracted toward center-of-mass not to center of planet. It's just close to the center of planet just in the case of human-scale body and the Earth. In other cosmic scale case center-of-mass will be located somewhere else. e.g. binary stars without significantly bigger one star, will have center-of-mass somewhere between them in the empty space.

  3. On 7/3/2020 at 2:28 PM, aimanmann said:

    I watched a video that shows a copper coin repel a iron needle, is possible? I read few note to make copper to attract iron like magnet. But to repel it, i found none of it

    Pass current through metal, and it will create magnetic field around it, which could attract or repel with other things.

    External magnetic field (invisible on video) could create eddy currents in metal.

    Metal could be initially electrostatically charged. It could be attracted (or repelled) by the same (or oppositely charged) element.

    Metal piece could have hidden hole with the real magnet inside of it. Or Copper/Gold/Silver/whatever is just coating on the surface. Example of trick for YouTube video.

  4. 55 minutes ago, swansont said:

    It’s not an energy source, like oil and natural gas, which represent stored energy.

    ...only if you have free access to (typically) gaseous Oxygen, with which fuel will react, during burning..

    Fuel + Oxygen => CO2 + H2O + energy (in the case of fossil fuels)

    Hydrogen + Oxygen => H2O + energy

    (without free access to Oxygen or other oxidizer, there will be no reaction, and no release of stored energy).

    55 minutes ago, swansont said:

    Plus a source if energy to create the hydrogen. 

    ...same with fossil fuels.. there had to be invested energy to create them from H2O and CO2 in the past, millions years ago..

    They remained under ground because they were not as volatile as gaseous Hydrogen..

  5. On 6/27/2020 at 5:44 PM, Strange said:

    I've never quite understood this. How does killing someone show to others that they will have everlasting life? It sounds more like proof you will die. Possibly horribly. It sounds like a really stupid thing to do. I'm really not sure that God thought this one through. One the other hand, it seems to have worked for a lot of people, so what do I know.

    Actually it is very simple. Religions evolve. Acquires some parts from older religions, merges or splits, rejecting part of older religion.

    It helps to get new followers, converting believers of older religion to newer religion, if you combine part of older religion. After centuries, millennia, without traces of written word, you cannot distinguish what is merged and its origin, as the all written materials never really existed, were destroyed accidentally, or destroyed on purpose, to removed traces of older religion, or are hidden in the ruins of ancient buildings buried under the desert sand..

    Remembering what I just said, analyze what religions were in ancient times on lands which are now known as Middle East. In some of them there were rituals of bloody sacrifices of people on the altar, tortured and/or killed, in the name of a god, to please him/her/it, appease to stop sending plagues, Earth Quakes, thunders, flooding, etc. etc.

    Look at story currently known as Binding of Isaac. In Isaac's time, Jews believed in completely different religions than 2000 years ago, and different than now. It is story showing transition of religion from older one, in which people were killing other people on altars, to religion in which it is forbidden. Instead of humans, they continued to give just animals and plants as sacrifice. In Christianity it was taken even further and the slaughter of animals on altars was also stopped (due to what you just said, it was "The Last Bloody Sacrifice"). It has been replaced by less violent, less cruel, more civilized, religious rituals.

  6. 5 hours ago, Airbrush said:

    Why did God or Jesus never talk to me in my dreams?

    Because online forum is a better place? ;) e.g. like this..

    5 hours ago, Airbrush said:

    I had many extraordinary, even surreal dreams but never, never, not once did Jesus telling me to go to mass, or God tell me what the true religion is.  

    ..people dream at night about stuff they usually made at day and/or wanted to do..

    e.g. if you will spend the all day/week/month long (literally) on playing game e.g. Scrabble, during sleep you will have dreams/nightmares about "what the best word can be made with supplied letters"..

    ..if you will spend the all day on playing Chess, during sleep you will have dreams/nightmares about "what the best move can be done on chessboard with supplied figures"..

     ..professional football players dream about "how they helped/failed team to win the match"..

    ..gold miners dream about finding the last final the biggest gold nugget which will make them rich..

    etc. etc.

    Priests, nuns, devoted prayers, regardless of religion, spending the all day long (literally) on praying, will have religious dreams at night..

    Priests, regardless of religion, who are doing it for money, will have dreams about people giving money and how they will spend donation..

    5 hours ago, Airbrush said:

    I think this is the basic story, the basis of Christianity.  

    ..I think it is more about origin of dreams/nightmares..

    5 hours ago, Airbrush said:

    Adam and Eve committed a grave offense against God the father by eating an apple that He told them NOT to eat.  Sounds like something kids will do if you tell them not to.  What person is NOT going to eat something delicious that they are told NOT to eat?  That is like saying "please eat this!"

    You are taking it too literally..

    Africa used to be a better place for living for humans in the past. Sahara used to be covered by plants. Change of climate thousands years ago destroyed a nice place for living to a hell on the Earth. People had to migrate to find a new habitable area. Remembrance of escaping from Africa gave the myth of being expelled from paradise. The rest of your post is just a continuation of this myth, and actions and reactions of humans to solve not existing in the reality problem of "being expelled from paradise"..

    5 hours ago, Airbrush said:

    Where did I go wrong? 

    ..except everywhere? ;)

    BTW, it is Old Testament. Common for Jews, Mulims and Christians.

    5 hours ago, Airbrush said:

    Earth needs more and more love,

    This is absolutely true.. Work in progress..


  7. 1 hour ago, Mordred said:

    Also geological evidence and meteor analysis including carbon dating match with the solar system materials we can examined thus far.

    Carbon C-14 radiometric dating works reliably only up to 50k years and only on organic remains because it has relatively fast decay rate with half-life ~ 5760 years. Did you mean Uranium and/or Rubidium-Strontium radiometric dating techniques instead? They are used to estimate rock age (actually to estimate the date when they were the last time melted).


  8. Start from counting the number of Carbon, Hydrogen, Oxygen, Sulfur and other atoms. Then search net using e.g. CxHyBr as keyword (x any y the number of atoms). This way you will find the name of compound. Repeat with the all others. Read Wikipedia articles about these compounds. Maybe these reactions are already described in these articles? It will be a good start of this homework. Don't expect people here will give you the all answers on the golden plate. It doesn't work this way. We are giving just hints, and you have to do the all work by yourself.

  9. 2 hours ago, mcmiller said:

    Our web-app should get 10s of thousands of daily traffic.

    Default Apache HTTP server config allows 256 concurrent requests. That's 22 millions per day..

    2 hours ago, mcmiller said:

    Basically, it's a dynamic web app, there will be .doc and .pdf documents uploaded and viewed... and some text boxes... practically no photos, NO videos, etc.

    Sounds pretty light-weight.. Unless the all people will start using service at the same hour..


    Average size of document?

    Estimate amount of data transfer per day.

    Client = user web browser from computer? or mobile application written for Android/iOS?

    Server = your computer? Virtual server that you rent from 3rd party? Dedicated server that you rent from 3rd party?


    If client = user with web browser, and server is your own machine, the easiest is to buy cloud and store data on it.

  10. If ads are enabled, YouTube pays approximately $1 per each 1000 views. So 1 mln views = $1k.

    Professional musicians typically earn money on concerts and selling CD/MP3.


    YouTube Partner Program application checklist:

    1. Make sure your channel follows our policies and guidelines. ...

    2. Have at least 1,000 subscribers and 4,000 valid public watch hours. ...

    3. Sign YPP terms. ...

    4. Make sure you only have 1 AdSense account.

    (4000 hours per year, is quite a lot for newbie, it is almost half year of watching by single person, or 4h for each of subscribers)


  11. Quote

    Freedom of speech - Can we really have it?

    I think it is a hard candy..

    Absolute freedom of speech is on forums without any moderation (i.e. when moderators and admins died, abandoned forum, lost access to forum etc. etc.).. and result is complete mess..  insults, spammers, religious extremists, political extremists, crackpots, people with mental problems 1) sharing their more or less insane ideas and eventually conspiracy theories, recruiting followers etc. etc. Such a forum is no longer a "friendly place for normal people"..

    If late Hitler would appear 2) on a modern Internet forum with proper moderation he would be banned quickly complaining that there is no freedom of speech on it..


    1) It has to be taken with carefulness. e.g. communists used to call their political opponents "crazy" and eventually putting them to madhouse (because "how to not love something so cool as Communist Party?!" Person must be insane! That was their thinking and/or a way to discredit opponents with possibility to put their to "prison" without any time frames (till they will start loving Communist Party or whatever else like in "1984" Big Brother) )

    2) He would be 3D computer graphician, freelancer with on-line portfolio, sharing work on YouTube, FB and Instagram.. He would not have to bother about "how to get to painting studies at the university"..

  12. On 6/3/2020 at 9:49 PM, Ashley Whiteley said:

    Please can someone help with this?

    What do you know about multi-threading?

    What functions do you use? How do you pass arguments and exchange results after finish etc.

  13. Quote

    Why do apples fall rather than lift off the ground?

    Leonard Susskind would say that there are existing parallel Universes in which everything is reversed and "apples lift off the ground" (but that would disallow creation of "apples" in the first place, so we have contradiction/paradox)..


  14. 22 hours ago, studiot said:

    I already asked that question about the liquid and you have suggested it must be ions, in which case it is decomposed.

    No. Decomposed NaCl would have formula 2Na and Cl2

    See on the other example CaCO3 (which really decomposes). It has positive ion Ca2+ and negative ion CO32- but after heating, it reaches decomposition temperature >= 840 C and molecule decomposes into CaO and CO2. CaO is still in ionic form Ca2+ and O2-.


  15. @studiot said that when you will pass current through molten sodium chloride, there will be produced metallic sodium and chlorine gas.. But you did not say you will be passing current through it, but it is plausible thing which you maybe omitted in your OP.


  16. 2 hours ago, joigus said:

    I remember a time when I was able to find exactly the page I was looking for by exactly reproducing the mistyping from the author. No longer the case.

    "You need to put words in quotes"...

    Does not work as good as in the past, but still you can find pages with the exact phrase used, as long as it is not the name of a company, product, marketing slogan or so.

  17. 37 minutes ago, joigus said:

    Exactly. Combinatorics of words much more powerful than choices of single words. +1

    Unfortunately it is starting to be working worser and worser with time, because Google sells keywords to their ad customers and articles that you see on the top of chain of results are not truly from search engine, but from ad auction. https://ads.google.com/

    You can see how much do you need to pay for specific keyword and statistics how many potential people will see it and how many potential people will click it.


  18. 2 hours ago, MigL said:

    Hey, maybe every new member should have to pass a Touring Turing Test, to ensure they are not 'bots.

    CAPTCHA is the reverse of the Turing test.


    "Because the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, a CAPTCHA is sometimes described as a reverse Turing test."


    ..and yes, this website has CAPTCHA during registration..


  19. @devicemaker

    I have an idea of device for you which you could build. But from other discipline than biology or biotechnology.

    Build remotely controlled (in a more advanced version quasi-automatic) submarine drone which will be searching for trash on the bottom of sea and be able to clean it from e.g. plastic or other difficult to destroy by nature trashes.

    With such pro-environmental ideas, it would be easy peasy to collect enough money using crowdfunding platforms to build a prototype and then production of ready devices.

    The "island of trash" problem must also be solved:



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