Science stories of the week

Discussion in 'General Science & Technology' started by wegs, Jan 31, 2021.

  1. DaveC426913 Valued Senior Member

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    Definitely.
    I have dreams where I am just a passive observer and the dream drives itself.
    I have dreams where I know what's going to happen, like a film I've seen before.
    I have dreams where things happen that are a complete shock - as if an external author wrote them.
    I have dreams where I can decide I don't want it to go that way ("AH! I'm falling!" Nope. Gonna take that in a different direction!)
    And I have lucid dreams where I know I'm dreaming.

    I even have episodes where I am half way between: aware I have slipped from fully-alert consciousness into a semi-conscious fugue, the state just before falling asleep.
    I am awake enough to observe what is happening, but I know I'm not fully awake because I can't hold onto thoughts. I forget after a second or two. And I am aware that this is happening. This can last quite some time.

    Wait. That's probably not what you meant...
     
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  3. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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    You corrected it with your interpretation

    I put this down to being in a hurry. Woke up about ½ hour ago ànd as I was answering the 2 nurses on medication round came in asking my name and data of birth - one gave me the pills the other jabbed the needle in and gave me the ear drops and tissues to do myself -

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    breakfast arrived but my bed table had rubbish banana skins from my night snacks which had to be cleared before tray could be put down

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    Two of many items because I don't eat the eggs option

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  5. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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    Back with dream

    Sentence below has been corrected
    Did seem like I was anyone else but the back pack helicopter pilot

    Last night was another dozzy

    I'm going to write it in notes and copy paste here little later

    Done result below

    Scene 1 number of people in a multi level spa

    Scene 2 two people in a room one by a sort of office type tray reading A4 size paper

    Scene 3 in a cat stopped beside another car and taking though our open windows

    Scene 4 people around odd shape feature with multiple lock mechanisms imbedded
    Seems like if we want money which we have earned we have to all use our keys at same time to unlock this whatever

    Woke up

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  7. DaveC426913 Valued Senior Member

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    Is that you??

    I always get a kick out of seeing the people behind the usernames.

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  8. wegs Matter and Pixie Dust Valued Senior Member

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    This sounds like an alien abduction. lol

    Hope you're going to be okay, Michael.
     
  9. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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    Yes is me

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  10. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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    We all looked human and no aliens seen

    Thank you
    Perhaps another week just to faten me up should make me ready to go home

    Few days home and hopefully soon after 4 weeks Bali with girlfriends

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  11. exchemist Valued Senior Member

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    That's because it's the size of the temperature difference that determines the rate of flow of heat. Your gas flame or heating element can generate a temperature difference between itself and the water of over 100 C deg., whereas the cold side of an A/C or fridge has to stay above 0C to avoid icing up, so the temperature difference is ~30C at the most.

    With the house, you have a constant influx of heat from outside, so the A/C has to pump that out all the time, just to stop it getting hotter. To actually take the temperature down, it has to pump out that plus a bit more. It's to do with the A/C capacity rather than anything intrinsic to heating up versus cooling down. Your A/C will be sized to do enough but not more, to save on the cost.
     
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  12. geordief Valued Senior Member

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    Enough with the conspiracy theories.That is an obvious head transplant.(they have blocked the ears to hold in the contents for the one)
     
  13. wegs Matter and Pixie Dust Valued Senior Member

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    Thanks for explaining - I had done a little research on the inner workings of an a/c unit and learned that part of its job is to ''extract hot air'' from the house, as part of the cooling process. I had no idea. lol
     
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  14. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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  15. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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  16. wegs Matter and Pixie Dust Valued Senior Member

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  17. DaveC426913 Valued Senior Member

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    Er... that's not quite what we mean by Observable Universe.

    It's just a radius defined by the light that can reach us since it was emitted. That radius only changes as time passes and as the universe expands.
     
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  18. wegs Matter and Pixie Dust Valued Senior Member

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    Okay.

    (Edit to add) :

    Observable universe - Wikipedia

    The word observable in this sense does not refer to the capability of modern technology to detect light or other information from an object, or whether there is anything to be detected. It refers to the physical limit created by the speed of light itself. No signal can travel faster than light, hence there is a maximum distance (called the particle horizon) beyond which nothing can be detected, as the signals could not have reached us yet. Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination (when hydrogen atoms were formed from protons and electrons and photons were emitted)—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional physical cosmology, the end of the inflationary epoch in modern cosmology).

    I learned something new today; I didn't realize that it doesn't refer to the capacity of modern technology to ''reveal'' more (to us), the observer.

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    Last edited: Aug 1, 2022
  19. wegs Matter and Pixie Dust Valued Senior Member

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  20. geordief Valued Senior Member

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  21. wegs Matter and Pixie Dust Valued Senior Member

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    For all you scientists out there, this one’s for you. I guess retractions mean that science is just doing its job.

    https://www.science.org/content/art...temperature-superconductivity-study-retracted

    The retraction comes even as excitement builds for the class of superconducting materials called hydrides, which includes the carbonaceous sulfur hydride (CSH) developed by Dias’s team. Under pressures greater than at the center of the Earth, hydrogen is thought to behave like a superconducting metal. Adding other elements to the hydrogen—creating a hydride structure—can increase the “chemical pressure,” reducing the need for external pressure and making superconductivity reachable in small laboratory vises called diamond anvil cells. As Lilia Boeri, a theoretical physicist at the Sapienza University of Rome, puts it, “These hydrides are a sort of realization of metallic hydrogen at slightly lower pressure.”

    Do you think that the physicist in question, should face any legal penalties? He didn't seem to think he did anything wrong but his peers are accusing him of ''misconduct.'' I was intrigued by this article because of what it could mean for electricity in the future, namely related to electric grids.
     
    Last edited: Sep 27, 2022 at 4:30 AM

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