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  #2141  
Old 09.04.2021, 00:22
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Re: Coronavirus

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And not try to think why something that lives for 2.2 microsec makes a difference.
Somebody might ask how the muons make it to the ground from the upper atmosphere (more than 10km up) if they live such a short time. They travel close to the speed of light (0.9999c), but even at that speed they'd only travel 0.6km.

Muons are a nice demonstration of time dilation (from our perspective) or length contraction (from its perspective) as predicted by Einstein's special theory of relativity. From our perspective, they can travel 42km; from its perspective, it only has to travel 0.14km.

You can actually detect cosmic-ray muons using cheap geiger counters from Banggood. Get two of them and stack them together separated by a sheet of lead. Gamma rays from environmental radioactivity don't have the energy to pass through the lead (and if they can - worry), but muons do. So any time they 'click' together, it's a muon and effectively came from the stars (or more accurately, its parent did).
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  #2142  
Old 09.04.2021, 21:57
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Re: Coronavirus

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Somebody might ask how the muons make it to the ground from the upper atmosphere (more than 10km up) if they live such a short time. They travel close to the speed of light (0.9999c), but even at that speed they'd only travel 0.6km.

Muons are a nice demonstration of time dilation (from our perspective) or length contraction (from its perspective) as predicted by Einstein's special theory of relativity. From our perspective, they can travel 42km; from its perspective, it only has to travel 0.14km.

You can actually detect cosmic-ray muons using cheap geiger counters from Banggood. Get two of them and stack them together separated by a sheet of lead. Gamma rays from environmental radioactivity don't have the energy to pass through the lead (and if they can - worry), but muons do. So any time they 'click' together, it's a muon and effectively came from the stars (or more accurately, its parent did).
How would you know that there are "generations" of them?

When you talked about "their time perspective" and "our time perspective" of their travel perception...that only matters in reference to distance travelled, right? Which is again different. It makes sense.
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  #2143  
Old 09.04.2021, 22:42
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Re: Coronavirus

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And not try to think why something that lives for 2.2 microsec makes a difference.
As was mentioned, Muons travel at relativistic speeds, they experience time dilation so the short 2.2 micro secs life is not really an issue.
One practical application is "muon scanning", currently in use in Fukushima to look through the reactor's concrete walls to accurately locate the reactor cores, or what remains of them, without risking radioactive contamination for the workers.

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How would you know that there are "generations" of them?
Each generation is a division of the elementary particles. The divided particles can be identified.
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  #2144  
Old 10.04.2021, 15:07
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Re: Coronavirus

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When you talked about "their time perspective" and "our time perspective" of their travel perception...that only matters in reference to distance travelled, right? Which is again different. It makes sense.
Yes, essentially; given that we're also talking about about 'distance travelled' through time.

There's a reasonably intuitive explanation of time dilation that I often dine out on, which is:

- Reality can be thought of as a four-dimensional entity (3 of space and 1 of time).

- All objects are travelling at the speed of light (including us).

- Objects with mass who are at rest (with respect to another object) are travelling through time at the speed of light; objects without mass are travelling through space at the speed of light (and are not travelling at all through time).

- When an object travels through space, it 'steals' something from the time dimension and so is travelling more slowly through that dimension in order that its total velocity is still the speed of light. This is basically Pythagoras' Theorem in four dimensions where you can think of total distance travelled as being sqrt(x^2 + y^2 + z^2 + t^2) (except that special relativity changes the sign of the t dimension for reasons beyond the scope of this post).
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  #2145  
Old 15.04.2021, 23:36
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Re: Ask a Scientist

The NASA Mars lander InSight’s solar panels are accumulating too much dust, preventing the lander from charging its batteries so risking a premature end to the mission, it is in emergency hibernation.

NASA's Opportunity rover stopped working in 2018 when its solar panels accumulated too much dust.

My question is why was InSight not equipped with some means to clean the solar panels, relying on winds to clear the dust is somewhat primitive.
There are many automatic solar panel cleaning systems available commercially which do not require water.
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  #2146  
Old 16.04.2021, 00:40
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Re: Coronavirus

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Yes, essentially; given that we're also talking about about 'distance travelled' through time.

There's a reasonably intuitive explanation of time dilation that I often dine out on, which is:

- Reality can be thought of as a four-dimensional entity (3 of space and 1 of time).
The "1 of time" being actually multiple. Which you mentioned bellow. It makes it multiple T, but specific. Right? It's logical.

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- All objects are travelling at the speed of light (including us).

- Objects with mass who are at rest (with respect to another object) are travelling through time at the speed of light; objects without mass are travelling through space at the speed of light (and are not travelling at all through time).

- When an object travels through space, it 'steals' something from the time dimension and so is travelling more slowly through that dimension in order that its total velocity is still the speed of light. This is basically Pythagoras' Theorem in four dimensions where you can think of total distance travelled as being sqrt(x^2 + y^2 + z^2 + t^2) (except that special relativity changes the sign of the t dimension for reasons beyond the scope of this post).
There is no more time for my uncle since 1700.

I can't even go to his funeral.
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  #2147  
Old 08.05.2021, 08:48
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Re: Ask a Scientist

Do you have a scientist you could consider a role model?
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  #2148  
Old 09.05.2021, 01:26
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Re: Ask a Scientist

…you chose wrong model scientist, for this forum...they are not corresponding to the views of the ''prominent'' members of this forum...also this scientists are extreme ''leftie''...and meta-science will cause some rash...
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  #2149  
Old 09.05.2021, 11:38
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Re: Ask a Scientist

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Do you have a scientist you could consider a role model?

Jules Henri Poincaré, Marie Curie, Ana Aslan.


Einstein. Stephen Hawking.

Many others.



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…you chose wrong model scientist, for this forum...they are not corresponding to the views of the ''prominent'' members of this forum...also this scientists are extreme ''leftie''...and meta-science will cause some rash...

Oh dear. So what. If you think they're worth your attention bring them on.

Prominent members amuse me.

Last edited by greenmount; 09.05.2021 at 12:20.
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  #2150  
Old 09.05.2021, 12:29
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Re: Ask a Scientist

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…you chose wrong model scientist, for this forum...they are not corresponding to the views of the ''prominent'' members of this forum...also this scientists are extreme ''leftie''...and meta-science will cause some rash...
Ha, the last sentense is poignant It's ok, the distance that anything meta- needs is on a scale, anyways. Same with the level of abstraction that is needed to create or understand systems and their frameworks, concepts, etc. So, allow for a rash.

Good to see your inspirations coming. I am not sure who's the ultimate for me...Dennett, maybe.
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  #2151  
Old 09.05.2021, 12:34
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Re: Ask a Scientist

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To me, at least those three do deserve this title:


- Avram Noam Chomsky: https://en.wikipedia.org/wiki/Noam_Chomsky


- John Ioannidis: https://en.wikipedia.org/wiki/John_Ioannidis


- Gerald Hüther: https://en.wikipedia.org/wiki/Gerald_H%C3%BCther


Damian
Really interesting. I have to say each of them support some theories I really like and some I disagree with! Wonderful.
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  #2152  
Old 09.05.2021, 18:06
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Re: Ask a Scientist

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To me, at least those three do deserve this title:


- Avram Noam Chomsky: https://en.wikipedia.org/wiki/Noam_Chomsky


- John Ioannidis: https://en.wikipedia.org/wiki/John_Ioannidis


- Gerald Hüther: https://en.wikipedia.org/wiki/Gerald_H%C3%BCther


Damian
That's an interesting list. I admire Ioannidis for his article on the reproducibility crisis in science.

I wonder what you think of Gerd_Gigerenzer. His work on risk, for instance in cancer screening, is fascinating, and beautifully written.
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  #2153  
Old 09.05.2021, 18:15
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Re: Ask a Scientist

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…you chose wrong model scientist, for this forum...they are not corresponding to the views of the ''prominent'' members of this forum...also this scientists are extreme ''leftie''...and meta-science will cause some rash...
That's very amusing. Who did you expect to be chosen? Werner von Braun?
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  #2154  
Old 09.05.2021, 23:17
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Re: Ask a Scientist

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Do you have a scientist you could consider a role model?
  • Isaac Newton
  • Isaac Newton
  • Isaac Newton

He “discovered” gravity, and invented calculus. 500 years ago.
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  #2155  
Old 09.05.2021, 23:26
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Re: Ask a Scientist

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  • Isaac Newton
  • Isaac Newton
  • Isaac Newton

He “discovered” gravity, and invented calculus. 500 years ago.
He was a major one, wasn't he, I agree. Your 500 years made me think - was Aristotle a scientist? How about Da Vinci?

Our idea of science got reduced to publications and citation indexes. I think that's why I asked about role models - somebody who inspired you beyond their science.
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  #2156  
Old 09.05.2021, 23:49
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Re: Ask a Scientist

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  • Isaac Newton
  • Isaac Newton
  • Isaac Newton

He “discovered” gravity, and invented calculus. 500 years ago.
Excellent choice for achievement, but a mixed bag as a role model, IMO.

He wrote more about interpreting the Bible than he did about science. This work is now seen as valueless by theologians.

He was also a fanatical alchemist, keeping his fire burning for days on end in pursuit of the Philosopher's stone.

As soon as he could, he left Cambridge to a presumed "soft job" as Master of the Royal Mint and exerted himself with the same energy and genius to pursuing , and having executed, counterfeiters.

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  #2157  
Old 10.05.2021, 02:04
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Re: Ask a Scientist

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That's very amusing. Who did you expect to be chosen? Werner von Braun?
…pop star in science, appointed by academies...those who is not out of box...servants of centralized education...
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  #2158  
Old 10.05.2021, 02:21
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Re: Ask a Scientist

…I would say, Kepler...as he understood universe without knowing lots of dates in equation...
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  #2159  
Old 11.05.2021, 00:32
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Re: Ask a Scientist

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Excellent choice for achievement, but a mixed bag as a role model, IMO.

(...)

He was also a fanatical alchemist, keeping his fire burning for days on end in pursuit of the Philosopher's stone.
Amen to that. By all accounts, he was an odd fellow. It has been argued that the spell of madness his contemporaries reported in the early 1690s was due to mercury poisoning. Apparently dangerous levels of the mercury and lead were found in his remains after exhumation. Brr. The book I read about it by Harold Klawans is probably out of print but there are lots of reports on the web.
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Old 11.05.2021, 01:17
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Re: Ask a Scientist

Role models among scientists? Tall order but a few thoughts:

Wangari Maathai? Apparently the first Kenyan woman to obtain a PhD in 1971 (in biology), she was instrumental in planting thousands of trees (some sources say millions) and to the Green Belt movement. She was also active in women‘s lib. Her husband divorced her, allegedly saying she was too strong for a woman and impossible to control.

Robert Oppenheimer was too conflicted to be much of a role model, but then again, he had every reason to be, and that is a fascinating story. For those interested: Lydia Millet wrote an improbable but very readable sci-fi book about him, Fermi and others called Oh Pure And Radiant Heart. Taught me where the bikini got its name, and lots of other stuff - spent at least as much time researching the historical background as actually reading it.

Wolfgang Pauli was too mercurial to qualify as a role model, except in one respect: when a new employee, confused by the rampant chaos at his institute, asked him what his job was, Pauli snapped at him: „Sie sollen mir widersprechen!“ (You are to contradict me.) That‘s how you get a Nobel prize. Results may vary when quoting him to superiors who prefer yes men.

Among Swiss Nobelists and alternative Nobelists, Jacques Dubochet and Hans Rudolf Herren? (You guessed. I‘ve been to Fridays for Future.) In the same vein, Dian Fossey and Jane Goodall. (Yes, I‘d call her a scientist, by all means.)

If logicians and polymaths qualify as scientists, or even if they don’t: what are role models anyway? In my youth, I was very impressed by Betrand Russell‘s autobiography. Ray Monk‘s The Ghost of Madness put an end to that. It has come under attack as too negative a portrait, but is pretty well backed up by Katharine Tait‘s little book on her father. Sometimes our gods topple as we mature.

Lots of food for thought. G‘night.
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