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I am wondering if anyone has had a Thallium Stress Test ? If so; did you have any side effects ?
My cousin just had a test and since then has had terrible discomfort in his chest area that he never had before.
Thank You . —Preceding unsigned comment added by 74.235.199.159 ( talk) 00:29, 14 September 2008 (UTC)
Contact the doctor. That is what they are there for.-- mboverload @ 02:18, 14 September 2008 (UTC)
No, call for an ambulance unless there is a doctor right at hand. "Terrible discomfort in the chest area" is an emergency situation! --Anonymous, 05:10 UTC, September 14, 2008.
If you had a stress test they must have give you an emergency contact number. Use it. Plasticup T/ C 02:30, 14 September 2008 (UTC)
I'm trying to figure out the name of a molecule, but I'm out of combinations. It looks like cyclopentane, but there is a nitrogen atom in place of one of the carbon atoms. No, this is not homework or anything, I'm just curious. Calamus Fortis 04:54, 14 September 2008 (UTC)
What is the gravelly, grinding noise that can be heard when pool acid is poured from the bottle into another vessel, or swirled in its own bottle ? It sounds as if there is a layer of gravel scratching around the bottom of the plastic container. -- 196.207.47.60 ( talk) 05:00, 14 September 2008 (UTC)
wat is meant by dark matter? —Preceding unsigned comment added by Donlesnar ( talk • contribs) 05:47, 14 September 2008 (UTC)
Does anyone know what the scientific name for this capability among animals is? We have a list at Category:Animals that can change colour and a request to fill in this missing information. (Can;t seem to link to it but it's there in fact) Thanks, Julia Rossi ( talk) 11:46, 14 September 2008 (UTC)
The mechanisms responsible for colouration strategies differ between species depending upon the nature of the pigment, the control over pigment distribution and the time frame over which pigments change. If different species do it in different ways, there may not be a catch-all phrase. Plasticup T/ C 16:11, 14 September 2008 (UTC)
What are some common things that weigh one milligram? —Preceding unsigned comment added by 80.148.22.232 ( talk) 12:30, 14 September 2008 (UTC)
My cousin (a nuclear enginneer) said that Vega can be used also as military rocket.Which distance is it able to do? Thanks. —Preceding unsigned comment added by Vindobona ( talk • contribs) 14:02, 14 September 2008 (UTC)
Italy has (like other EU contries) is able to build a nuke actually very quickly.It doesn't build because he decided to do not build it and so itself decided it! My cousin teaches nuclear physics in Milan.He says that country like Italy officially haven't the nuke because of NPT,but Italian Army did several years ago what it wanted.It had nuclear research centres only for military aims.Vega derives from Scout so he said it's very good for military aims(it's also too much!).He told me also that EU (by a small law wanted by Italy and Germany;at that time EU didn't exist)can declare itself nuclear power.The same thing i heard by the Italian ambassador in UN.I think they know more than us. PS Nowhere is written that you have to keep the rocket in a silo especally if you set it on something moving. Thanks. —Preceding unsigned comment added by Vindobona ( talk • contribs) 18:41, 14 September 2008 (UTC)
In UK are built no parts of Vega. Italy builds the 65% of launcher and it's able to build everithing it wants.Be sure!I haven't yet received an answer about its distance on Earth! —Preceding unsigned comment added by Vindobona ( talk • contribs) 09:53, 15 September 2008 (UTC)
This isn't a rational answer.The rocket can also landing!The problem is going up and not landing!It's also too strong !Certainly it 's able to cover many many thousands Km.Also Stone said "Yes it can be used!".Thanks. —Preceding unsigned comment added by Vindobona ( talk • contribs) 14:52, 15 September 2008 (UTC)
What does TRH do in the gastro-intestinal tract? can someone give further links to reading sources? 117.97.145.59 ( talk) 14:06, 14 September 2008 (UTC)
I went to my friend's home with him. His home is in another city, some 7 hours away by train. He was away from his home for several weeks. When we got there their dog was waiting at the gate for him. His dad told us that the dog had been standing outside and waiting all day long, as if he knew my friend was coming. He said it happens every time he's about to come home. Any scientific explanation for this? ReluctantPhilosopher ( talk) 14:22, 14 September 2008 (UTC)
You look at a lamp or the sun and it leaves an imprint in your eye, which discolours what you are looking at, making it purple, black-and-white, or just false colour?-- Editor510 drop us a line, mate 16:56, 14 September 2008 (UTC)
Hi. I'm trying to identify the species of a couple of plants from my mother's garden. For geographical/climate information, these plants are growing in North Texas.
The first is a vine with bright pink flowers that bloom at night. (These photos are taken during the day):
These others are delicate purple blooms:
If they turn out to be pictures we could use, I'll re-upload them with more useful file names. Thanks in advance to anyone who can help. - GTBacchus( talk) 19:12, 14 September 2008 (UTC)
I think the pink night-bloomer might be Angel's Trumpet ( Datura). According to our article on that, it comes in pink, is shaped like the flowers in your picture and blossoms at night. 128.239.177.28 ( talk) 13:26, 15 September 2008 (UTC)Hana
Lets say we want to turn the F-22 into an ornithopter. Its empty mass is about 19,700 kg. If we assume its wing area remains the same (840 ft² (78.04 m²)), how fast does it have to flap in order to hover? I'm aware of the technological limitations of such things, but for this thought experiment, lets just ignore how we could build such a thing. ScienceApe ( talk) 19:36, 14 September 2008 (UTC)
It would probably be dependant on wing dimensions and hence the F22 probably isn't a very good choice. Something like a B2 Spirit (due to its massive wingspan compared to the body) or a C-130 because presumably from its ability to take off from very small runways it must create a lot of lift, and be light. 88.211.96.3 ( talk) 13:07, 18 September 2008 (UTC)
I was told by someone who was very much involved in the US H-bomb program that in the 1950s the inverse Compton effect was regarded as a big secret because it had major implications for hydrogen bomb design.
Can someone more literate in physics explain to me why this might be so? And if the Compton effect is relatively common, would it be much to expect that someone scientifically literate would not happen upon the likelihood that the inverse Compton effect would exist and have relevance to such an endeavor? The article on Compton scattering didn't really help me in wrapping my mind around this question, other than indicating that the inverse effect seems pretty rare under Earth conditions (i.e. it seems like it only takes place in regards to astrophysics, and presumably in nuclear weapons though it doesn't say that). -- 98.217.8.46 ( talk) 20:10, 14 September 2008 (UTC)
Please could someone explain why it is not easy to see through gold leaf, when the material is only one atom thick? It is possible to see through the material if you hold it close but it is not transparent in the same way that air or many types of glass are.
My understanding of the scale of the atom is that if the nucleus was the size of the circle at the centre of Wembley Stadium, then the electons would be vastly smaller and whizzing around within a cloud the size of the whole stadium.
I also understand that gold has 79 electrons, but these are so, so small then surely, even as a fast-moving cloud I cannot believe that they could form the illusion of a solid space to the human eye.
Using the same argument, I also struggle to understand why it is possible to see through vast volumes of air. On a clear day, from a reasonable height, it is possible to see around 20 miles (and much further from the top of some skyscrapers). When looking this far, the observer is looking through a block of air. I would have thought that, as sparse as the atoms/molecules in air are, over this distance the chances are that there would be many atoms or molecules 'obstructing' the observer's line of sight - yet he or she can still see through.
So...what property of materials makes us able to see though some and not others (oher than their depth)? Thank you Jilly ( talk) 20:21, 14 September 2008 (UTC)
The articles on Prostatitis and on BPH don"t mention treatments such as ejaculation, eating radishes, drinking cranberry juice. Is this type of treatment addressed somewhere? They do mention avoiding caffeine as a prevention. Also, if antibiotics such as cipro and doxycycline alleviate symptoms for a period of months is there an antibiotic that offers longer relief? Bigprostate ( talk) 20:35, 14 September 2008 (UTC)
I parallel universes exist, is it possible to communicate or travel between them? —Preceding unsigned comment added by 79.76.164.210 ( talk) 22:03, 14 September 2008 (UTC)
...that it has somehow permanently altered his entire blood chemistry, meaning that a transfusion of normal, healthy blood would kill him - and turned his own blood so toxic that if transfused into another person, it would kill them instantly.
Urban legend/toughguy publicity posturing or genuine possibility? Not naming any names, a) due to WP:BLP, b) I've heard the same story attached to at least three different people. -- Kurt Shaped Box ( talk) 23:10, 14 September 2008 (UTC)
Is "why" a valid question in science. For example, "Why is there a universe, rather than none?" or "Why does the apple falls?" or "Why does the atomic nucleus does not integrate?" etc.
Please provide examples from scientific papers and the academia.
Is "Why" a valid of question of science? —Preceding unsigned comment added by 98.97.102.6 ( talk) 23:12, 14 September 2008 (UTC)
When an apple falls from a tree - science says "How" is because there is this gravitational field, curved earth, etc. In that case, the "Why" is because it simply can't do anything else. "Why" isn't a problem for things that are already well-explained. Why is only a serious problem for the "end point" questions. "Why" does mass produce a gravitational field is a question we can't answer because we don't know the "How" part (yet). Perhaps studies in the LHC of the Higgs Boson will explain where mass comes from and perhaps that'll explain "Why" masses produce gravity. If we knew HOW gravity was produced then we'd probably say "Why" is (again) because it can't do otherwise. So it seems to me that once we know "How" - then in a predominantly mechanistic universe, the answer to "Why" is that things couldn't possibly have turned out any differently. Things are perhaps a little different at the quantum level because things can often turn out in multiple ways - seemingly at random. In that case - we can ask "Why did Schrodinger's cat die when we did the classic thought experiment?" - or "Why did it survive?" - the answer is "because the radioactive atom either did or didn't emit a neutron" - but we can just ask "Why did/didn't the atom do that?"...and now, we don't know "Why" because it could just as easily have done the opposite. But even in those cases, we might hypothesise the "Many worlds" interpretation in which the cat dies in one version of the universe and not in another. When you do that, the question "Why did the cat die?" boils down "Because we are in the universe in which it dies and not in the one where it survives."...then you ask "Why are we in that universe" and the answer is..."We're in both universes at the same time".
So I think we can always boil down any "Why" question into an explanation of "How" (assuming we know) - followed by "...and that's the only possible way things could have turned out." - which answers the "Why" part. SteveBaker ( talk) 18:06, 15 September 2008 (UTC)
Science desk | ||
---|---|---|
< September 13 | << Aug | September | Oct >> | September 15 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
I am wondering if anyone has had a Thallium Stress Test ? If so; did you have any side effects ?
My cousin just had a test and since then has had terrible discomfort in his chest area that he never had before.
Thank You . —Preceding unsigned comment added by 74.235.199.159 ( talk) 00:29, 14 September 2008 (UTC)
Contact the doctor. That is what they are there for.-- mboverload @ 02:18, 14 September 2008 (UTC)
No, call for an ambulance unless there is a doctor right at hand. "Terrible discomfort in the chest area" is an emergency situation! --Anonymous, 05:10 UTC, September 14, 2008.
If you had a stress test they must have give you an emergency contact number. Use it. Plasticup T/ C 02:30, 14 September 2008 (UTC)
I'm trying to figure out the name of a molecule, but I'm out of combinations. It looks like cyclopentane, but there is a nitrogen atom in place of one of the carbon atoms. No, this is not homework or anything, I'm just curious. Calamus Fortis 04:54, 14 September 2008 (UTC)
What is the gravelly, grinding noise that can be heard when pool acid is poured from the bottle into another vessel, or swirled in its own bottle ? It sounds as if there is a layer of gravel scratching around the bottom of the plastic container. -- 196.207.47.60 ( talk) 05:00, 14 September 2008 (UTC)
wat is meant by dark matter? —Preceding unsigned comment added by Donlesnar ( talk • contribs) 05:47, 14 September 2008 (UTC)
Does anyone know what the scientific name for this capability among animals is? We have a list at Category:Animals that can change colour and a request to fill in this missing information. (Can;t seem to link to it but it's there in fact) Thanks, Julia Rossi ( talk) 11:46, 14 September 2008 (UTC)
The mechanisms responsible for colouration strategies differ between species depending upon the nature of the pigment, the control over pigment distribution and the time frame over which pigments change. If different species do it in different ways, there may not be a catch-all phrase. Plasticup T/ C 16:11, 14 September 2008 (UTC)
What are some common things that weigh one milligram? —Preceding unsigned comment added by 80.148.22.232 ( talk) 12:30, 14 September 2008 (UTC)
My cousin (a nuclear enginneer) said that Vega can be used also as military rocket.Which distance is it able to do? Thanks. —Preceding unsigned comment added by Vindobona ( talk • contribs) 14:02, 14 September 2008 (UTC)
Italy has (like other EU contries) is able to build a nuke actually very quickly.It doesn't build because he decided to do not build it and so itself decided it! My cousin teaches nuclear physics in Milan.He says that country like Italy officially haven't the nuke because of NPT,but Italian Army did several years ago what it wanted.It had nuclear research centres only for military aims.Vega derives from Scout so he said it's very good for military aims(it's also too much!).He told me also that EU (by a small law wanted by Italy and Germany;at that time EU didn't exist)can declare itself nuclear power.The same thing i heard by the Italian ambassador in UN.I think they know more than us. PS Nowhere is written that you have to keep the rocket in a silo especally if you set it on something moving. Thanks. —Preceding unsigned comment added by Vindobona ( talk • contribs) 18:41, 14 September 2008 (UTC)
In UK are built no parts of Vega. Italy builds the 65% of launcher and it's able to build everithing it wants.Be sure!I haven't yet received an answer about its distance on Earth! —Preceding unsigned comment added by Vindobona ( talk • contribs) 09:53, 15 September 2008 (UTC)
This isn't a rational answer.The rocket can also landing!The problem is going up and not landing!It's also too strong !Certainly it 's able to cover many many thousands Km.Also Stone said "Yes it can be used!".Thanks. —Preceding unsigned comment added by Vindobona ( talk • contribs) 14:52, 15 September 2008 (UTC)
What does TRH do in the gastro-intestinal tract? can someone give further links to reading sources? 117.97.145.59 ( talk) 14:06, 14 September 2008 (UTC)
I went to my friend's home with him. His home is in another city, some 7 hours away by train. He was away from his home for several weeks. When we got there their dog was waiting at the gate for him. His dad told us that the dog had been standing outside and waiting all day long, as if he knew my friend was coming. He said it happens every time he's about to come home. Any scientific explanation for this? ReluctantPhilosopher ( talk) 14:22, 14 September 2008 (UTC)
You look at a lamp or the sun and it leaves an imprint in your eye, which discolours what you are looking at, making it purple, black-and-white, or just false colour?-- Editor510 drop us a line, mate 16:56, 14 September 2008 (UTC)
Hi. I'm trying to identify the species of a couple of plants from my mother's garden. For geographical/climate information, these plants are growing in North Texas.
The first is a vine with bright pink flowers that bloom at night. (These photos are taken during the day):
These others are delicate purple blooms:
If they turn out to be pictures we could use, I'll re-upload them with more useful file names. Thanks in advance to anyone who can help. - GTBacchus( talk) 19:12, 14 September 2008 (UTC)
I think the pink night-bloomer might be Angel's Trumpet ( Datura). According to our article on that, it comes in pink, is shaped like the flowers in your picture and blossoms at night. 128.239.177.28 ( talk) 13:26, 15 September 2008 (UTC)Hana
Lets say we want to turn the F-22 into an ornithopter. Its empty mass is about 19,700 kg. If we assume its wing area remains the same (840 ft² (78.04 m²)), how fast does it have to flap in order to hover? I'm aware of the technological limitations of such things, but for this thought experiment, lets just ignore how we could build such a thing. ScienceApe ( talk) 19:36, 14 September 2008 (UTC)
It would probably be dependant on wing dimensions and hence the F22 probably isn't a very good choice. Something like a B2 Spirit (due to its massive wingspan compared to the body) or a C-130 because presumably from its ability to take off from very small runways it must create a lot of lift, and be light. 88.211.96.3 ( talk) 13:07, 18 September 2008 (UTC)
I was told by someone who was very much involved in the US H-bomb program that in the 1950s the inverse Compton effect was regarded as a big secret because it had major implications for hydrogen bomb design.
Can someone more literate in physics explain to me why this might be so? And if the Compton effect is relatively common, would it be much to expect that someone scientifically literate would not happen upon the likelihood that the inverse Compton effect would exist and have relevance to such an endeavor? The article on Compton scattering didn't really help me in wrapping my mind around this question, other than indicating that the inverse effect seems pretty rare under Earth conditions (i.e. it seems like it only takes place in regards to astrophysics, and presumably in nuclear weapons though it doesn't say that). -- 98.217.8.46 ( talk) 20:10, 14 September 2008 (UTC)
Please could someone explain why it is not easy to see through gold leaf, when the material is only one atom thick? It is possible to see through the material if you hold it close but it is not transparent in the same way that air or many types of glass are.
My understanding of the scale of the atom is that if the nucleus was the size of the circle at the centre of Wembley Stadium, then the electons would be vastly smaller and whizzing around within a cloud the size of the whole stadium.
I also understand that gold has 79 electrons, but these are so, so small then surely, even as a fast-moving cloud I cannot believe that they could form the illusion of a solid space to the human eye.
Using the same argument, I also struggle to understand why it is possible to see through vast volumes of air. On a clear day, from a reasonable height, it is possible to see around 20 miles (and much further from the top of some skyscrapers). When looking this far, the observer is looking through a block of air. I would have thought that, as sparse as the atoms/molecules in air are, over this distance the chances are that there would be many atoms or molecules 'obstructing' the observer's line of sight - yet he or she can still see through.
So...what property of materials makes us able to see though some and not others (oher than their depth)? Thank you Jilly ( talk) 20:21, 14 September 2008 (UTC)
The articles on Prostatitis and on BPH don"t mention treatments such as ejaculation, eating radishes, drinking cranberry juice. Is this type of treatment addressed somewhere? They do mention avoiding caffeine as a prevention. Also, if antibiotics such as cipro and doxycycline alleviate symptoms for a period of months is there an antibiotic that offers longer relief? Bigprostate ( talk) 20:35, 14 September 2008 (UTC)
I parallel universes exist, is it possible to communicate or travel between them? —Preceding unsigned comment added by 79.76.164.210 ( talk) 22:03, 14 September 2008 (UTC)
...that it has somehow permanently altered his entire blood chemistry, meaning that a transfusion of normal, healthy blood would kill him - and turned his own blood so toxic that if transfused into another person, it would kill them instantly.
Urban legend/toughguy publicity posturing or genuine possibility? Not naming any names, a) due to WP:BLP, b) I've heard the same story attached to at least three different people. -- Kurt Shaped Box ( talk) 23:10, 14 September 2008 (UTC)
Is "why" a valid question in science. For example, "Why is there a universe, rather than none?" or "Why does the apple falls?" or "Why does the atomic nucleus does not integrate?" etc.
Please provide examples from scientific papers and the academia.
Is "Why" a valid of question of science? —Preceding unsigned comment added by 98.97.102.6 ( talk) 23:12, 14 September 2008 (UTC)
When an apple falls from a tree - science says "How" is because there is this gravitational field, curved earth, etc. In that case, the "Why" is because it simply can't do anything else. "Why" isn't a problem for things that are already well-explained. Why is only a serious problem for the "end point" questions. "Why" does mass produce a gravitational field is a question we can't answer because we don't know the "How" part (yet). Perhaps studies in the LHC of the Higgs Boson will explain where mass comes from and perhaps that'll explain "Why" masses produce gravity. If we knew HOW gravity was produced then we'd probably say "Why" is (again) because it can't do otherwise. So it seems to me that once we know "How" - then in a predominantly mechanistic universe, the answer to "Why" is that things couldn't possibly have turned out any differently. Things are perhaps a little different at the quantum level because things can often turn out in multiple ways - seemingly at random. In that case - we can ask "Why did Schrodinger's cat die when we did the classic thought experiment?" - or "Why did it survive?" - the answer is "because the radioactive atom either did or didn't emit a neutron" - but we can just ask "Why did/didn't the atom do that?"...and now, we don't know "Why" because it could just as easily have done the opposite. But even in those cases, we might hypothesise the "Many worlds" interpretation in which the cat dies in one version of the universe and not in another. When you do that, the question "Why did the cat die?" boils down "Because we are in the universe in which it dies and not in the one where it survives."...then you ask "Why are we in that universe" and the answer is..."We're in both universes at the same time".
So I think we can always boil down any "Why" question into an explanation of "How" (assuming we know) - followed by "...and that's the only possible way things could have turned out." - which answers the "Why" part. SteveBaker ( talk) 18:06, 15 September 2008 (UTC)