What are the differences, if any, (chemically, activity-wise, etc.) in the brain between when having a dream and when having a nightmare? |
- What are the differences, if any, (chemically, activity-wise, etc.) in the brain between when having a dream and when having a nightmare?
- Photons of a specific frequency are absorbed by atoms. How precise must that frequency be?
- Why can't I look at a word without reading it?
- Why do my drawings in foggy windows reappear when the window re-condensates later?
- Can we heat a ball of iron enveloped by a dense layer of rock without heating the rock itself?
- Is there a relationship between Miosis/Mydrasis and treatment of glucoma?
- Where did all the carbon dioxide come from?
- Is the science community actively looking at ways to live with global climate change?
- Does any substance exist that has a triple point at STP or standard pressure?
- How are we sure that other galaxies, or even other solar systems, aren't made up entirely of anti-matter?
- If brains are so much more advanced than any other computer on known to man, why can even the cheapest calculators do math so much better than us?
- How fast does Henry's Law work?
- What's the maximum height I could survive a fall from, landing on a very soft material such as cotton wool?
- Why are so many energy equations of the form E=(1/2)xy^2? Kinetic, elastic, heat, capacitor and inductor energy all have this form. Even E=mc^2 is almost there.
- Why is infrared 'hotter' than other parts of the EM spectrum?
- Can we Re-measure Redshift to Prove Continued Expansion of the Universe ?
- How is .33 repeating, ACTUALLY the same as 1/3?
- Why doesn't the Moon's gravity seem to affect anything other than the ocean tides?
- How close could the moon orbit the earth and how big would it appear in the sky if it were that close?
- What is the difference between weak hypercharge and electric charge, and weak isospin and spin?
- How much force is exerted on my mirror if I am lighting it with a moderately strong flashlight from two meters?
- Is there a formula to calculate a nuclide's halflife, or is it all scientifically collected data?
| Posted: 22 Nov 2015 09:25 PM PST I'm aware it's all REM, but are there any differences? Side question: without access to my heart rate, respiration rate, etc. but with access to a brain scan, would an expert be able to tell if I was having a nightmare as opposed to a dream? (In case you're wondering: yeah, I just had a nightmare and am trying to calm down so I can go back to sleep...) [link] [32 comments]  |
| Photons of a specific frequency are absorbed by atoms. How precise must that frequency be? Posted: 22 Nov 2015 09:10 PM PST I was taught that certain elements' electrons absorb and emit photons of specific frequencies. Well, how specific must the frequency be? Suppose an element X absorbs photons of frequency F. Would the atom absorb photons of frequency F+1? Given that atoms are moving / rotating / not actually in one place at one time, how does this absorption even occur? Wouldn't doppler shift cause the frequency to not ever be exactly F? Does the photon have to hit directly? [link] [27 comments]  |
| Why can't I look at a word without reading it? Posted: 22 Nov 2015 06:28 PM PST |
| Why do my drawings in foggy windows reappear when the window re-condensates later? Posted: 22 Nov 2015 08:42 PM PST When windows get foggy they retain the last fog drawing/writing I made even though they lost their fog and regained it. This can last for months, in my experience. Shouldn't it be a clean slate every time? My only idea was that the oil on your hands gets on the windows and prevents it from condensating in those specific places, but this phenomenon occurs regardless of the material I wipe the window with. [link] [10 comments]  |
| Can we heat a ball of iron enveloped by a dense layer of rock without heating the rock itself? Posted: 22 Nov 2015 10:54 PM PST I was admiring the prospects of humans inhabiting Mars and I started to wonder if it was possible to restart mantle convection. I know that it is much more complex than this, but is there a way to somehow pass energy though rock in some way to heat metal? If this was possible, do you think its feasible to drill down to a certain level and start passing energy to the center of a planet's core? I would like to think that this energy just needs to excite the planet's core more than it excites rock. [link] [15 comments]  |
| Is there a relationship between Miosis/Mydrasis and treatment of glucoma? Posted: 22 Nov 2015 08:50 PM PST mydriasis* title They say when giving a drug that cause miosis you are opening canal of schlemm and Increasing the drainage of aqueous humour thus lowering the intraocular pressure how is that ? how is constrictor or dilator pupillae connected to canal of schlemm? thanks [link] [2 comments]  |
| Where did all the carbon dioxide come from? Posted: 22 Nov 2015 07:20 PM PST There seem to be a lot of articles, such as this one , recently about cyanobacteria making oxygen when the Earth was still young via photosynthesis. They often talk about "the great oxidization event", but nobody ever talks about where the carbon dioxide came from. Where did the carbon dioxide come from? ( I tried searching Google, but all the results I read through talk about global warming and the current CO2 crisis, but they don't talk about ancient CO2 ) [link] [7 comments]  |
| Is the science community actively looking at ways to live with global climate change? Posted: 23 Nov 2015 12:27 AM PST I ask because what I mostly hear in the medis is how we have to stop climate change and how we should be preventing from getting worse. To my mind, there isn't a way of stopping it or preventing it at this point. I don't think there is supposed to be. This planet works in cycles and we are in a climate cycle. I'm just curious if we as a planet are doing enough to understand how to live here when climate change continues. [link] [10 comments]  |
| Does any substance exist that has a triple point at STP or standard pressure? Posted: 22 Nov 2015 07:40 PM PST |
| Posted: 22 Nov 2015 01:30 PM PST I know that it's assumed that most of the universe at large is made of up regular matter, as opposed to anti-matter. How exactly do we know this without being able to interact with it? [link] [12 comments]  |
| Posted: 22 Nov 2015 06:58 PM PST Our brains are more advanced than any other computer know to man, but why can even the cheapest calculators solve math equations faster and more accurate than us? How are calculators designed to do math in a way that we are not? [link] [18 comments]  |
| How fast does Henry's Law work? Posted: 22 Nov 2015 09:28 PM PST I'm curious about how rapidly oceans eat carbon dioxide. But any model is complicated by weathering (if I understand the chemistry, more calcium/salt/iron "salt" from erosion means more ocean sequestration, but I can't source the linkage between rain, wind, erosion, and minerals, and then there is the role of life in the system) so any help on an abstraction is helpful to me. Assume the concentration of co2 in the air is 400 ppm. Assume the air is 25c. Assume pressure is 101.3 Kp. Assume I have a pool that is 1 hectare wide and long and 1 centimeter deep, and in my fantasy model, the concentration of carbon ion is 0 ppm. So that's 10 million liters of thin, still, 25c water. Assume that the water is sterile. How long does it take for the concentration of carbon ion in the water to match the carbon dioxide in the air? How long does it take for the system to reach equilibrium? Is this system really that sensitive to salt? If Sequestration is damn slow because Henry's Law acts damn slow, that's interesting. If sequestration is slow because precipitation is damn slow, that's another thing altogether. [link] [4 comments]  |
| Posted: 22 Nov 2015 07:45 AM PST Not the exact height, just the magnitude would be interesting. [link] [57 comments]  |
| Posted: 23 Nov 2015 06:23 AM PST So as I've gone further into physics I keep seeing this pattern pop up. Many equations for energy have the form E=(1/2)xy2. That is half times a variable times another variable squared. Is there a reason for this pattern or just coincidence? I would have thought different forms of energy would have very different equations for the most part. [link] [1 comment]  |
| Why is infrared 'hotter' than other parts of the EM spectrum? Posted: 22 Nov 2015 02:38 PM PST Visible light has a shorter wavelength (and is more energetic) than IR, so why is it IR that's associated with heat, as opposed to any other wavelength? This is a bit embarrassing, because I'm training to be a physics teacher and I suddenly confused myself while planning a lesson about radiation! [link] [10 comments]  |
| Can we Re-measure Redshift to Prove Continued Expansion of the Universe ? Posted: 22 Nov 2015 11:45 AM PST Could the degree of redshift initially observed in specific distant galaxies that was considered evidence of an expanding universe be re-measured today. Why do that ? Just to confirm that the degree of redshift observed now is what whould be expected from those same specific galaxies based on the amount of time elapsed between then and now. If that degree of redshift has in fact changed according to a predictable formula (based on speed of expansion), that would provide yet another indication of the accuracy of the expansion theory. Right ? Has/will that be done soon ? [link] [13 comments]  |
| How is .33 repeating, ACTUALLY the same as 1/3? Posted: 22 Nov 2015 06:08 PM PST .33 repeating (in my mind) is not actually 1/3. it is in my understanding .33 is infinite. But, if I am right in understanding that.. 3 x (33...) < 1 I recognize that the suffix "repeating" is referring to an infinite distinction, which would mean (presumably) the "missing" .1nth percent will never be accounted for because of the nature of infinity. (Here's where I can't seemingly wrap my head around so bare with me...) What happens to that .1nth percent of data that is seemingly lost in calculations of what we understand as "1/3rd"? [link] [34 comments]  |
| Why doesn't the Moon's gravity seem to affect anything other than the ocean tides? Posted: 22 Nov 2015 09:18 AM PST Bonus question: do I weigh less when the moon is directly overhead? [link] [10 comments]  |
| Posted: 22 Nov 2015 10:40 AM PST |
| What is the difference between weak hypercharge and electric charge, and weak isospin and spin? Posted: 22 Nov 2015 12:53 PM PST |
| Posted: 22 Nov 2015 03:31 PM PST English is not my native language so you will have to excuse me and please ask if you did not understand. [link] [13 comments]  |
| Is there a formula to calculate a nuclide's halflife, or is it all scientifically collected data? Posted: 22 Nov 2015 11:09 AM PST I'm starting to grok the table of nuclides, and there's nothing about halflife on the chart itself, only decay modes. Is there an absolute formula that gives us the expected picture, or is it all experimentally collected data? [link] [6 comments]  |
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