How did the Great Wall of China affect the region's animal populations? Were there measures in place to allow migration of animals from one side to another? |
- How did the Great Wall of China affect the region's animal populations? Were there measures in place to allow migration of animals from one side to another?
- A common criticism of the Bohr model was that orbiting electrons should produce EM waves, lose energy, and therefore eventually spiral towards the nucleus. Similarly, if gravitational waves exist, won't the Earth/other planets fall into the Sun?
- How can you differentiate the influence of redshift from the doppler effect in an expanding universe?
- How does modern colorization of black & white film photographs or moving pictures work?
- Does acupuncture work?
- If I "butt chug" alcohol will I still fail a breathalyzer like I would if I drank the alcohol orally?
- Does the salt dropped on roads every winter have any major ecological impacts?
- Why is it so hard to predict supernovae?
- What secondary functions are there to pupil dilation/restriction?
- How did Fermat know how to postulate his Last Theorem without knowing that it works?
- If gravity is one of the weakest natural forces, then why is it the dominate force in space?
- Why is it a joke to ask someone to explain where layer 6 of the OSI model is?
- If time and space are parts of the same thing, is there equivalency in their measurement? In a 4-dimensional graph with axes X/Y/Z/T, can we say that "1 foot of distance along axis X equals 5.3 seconds of movement along axis T"?
- Why does Copper (and/or Silver) Kill Bacteria, but not so much our own cells?
- Speed of Light? I am Confused :S
- In what form is energy stored in fossil fuels?
- Is it true that we've only explored 1% of the world's oceans?
- Can genes be partially-methylated?
- Does the outer layer of our atmosphere move about in "swells" like the surface of our ocean, or is it more stable?
- I have a simple question and I'm in need of a simple answer on CRT technology screen displays, would you help?
- Is it possible to use a set of units for measurement (length, time etc.) that would negate the need for universal constants?
- Can there exist a set of cognitive tests/tasks (computerized or not) that healthy people perform fluently but (only) 'schizophrenia' patients perform with difficulties?
- If the Sun is really just a ball of gas, what keeps it from dissipating?
| Posted: 21 Mar 2016 09:38 AM PDT With all this talk about building walls, one thing I don't really see being discussed is the environmental impact of the wall. The Great Wall of China seems analogous and I was wondering if there were studies done on that. [link] [comments]  |
| Posted: 22 Mar 2016 04:50 AM PDT |
| Posted: 22 Mar 2016 03:34 AM PDT So I learned that the redshift in the light from other galaxies is not due to relative movement, but because space itself expands in the lights way and therefore stretching the wavelength. How can you tell, that the source of the signal is maybe closer than you think and just traveling away from us, therefore having a positive influence on the redshift of the signal OR The source is traveling towards us, therefore negating a little of the redshift (expanding space) by blue shifting (due to the doppler effect)? I hope I made my question clear, however feel free to follow up. [link] [comments]  |
| How does modern colorization of black & white film photographs or moving pictures work? Posted: 22 Mar 2016 05:16 AM PDT Is it merely guesswork, or are certain shades of grey able to be precisely equated to certain colors? I would imagine that would require the ability to precisely re-create the lighting scenario of the original, which seems unlikely to be possible in nearly all situations. I'm familiar with early techniques such as using paint or ink directly over a photo, but I refer more to recent techniques we see in the media, such as used in the TV series "World War II in Colour" or the recent release of colorized images from Tut's tomb. In the case of the former, I imagine there must be a fairly automated way to do this, because the number of cells involved in any moving image would be prohibitively large for most uses. In the case of the latter, where some of the objects can be readily found and examined, can the use of a few known values work to calibrate for the rest of the values, or is it pretty much all just educated guesswork? [link] [comments]  |
| Posted: 22 Mar 2016 05:33 AM PDT I have moderate back pain. I see a chiropractor once a month, but I have been looking into other ways as well. [link] [comments]  |
| Posted: 21 Mar 2016 04:42 PM PDT |
| Does the salt dropped on roads every winter have any major ecological impacts? Posted: 21 Mar 2016 07:58 PM PDT |
| Why is it so hard to predict supernovae? Posted: 21 Mar 2016 10:37 PM PDT Inspired by Kepler's big observation of a supernova: I understand this supernova was observed because Kepler takes a constant survey of the sky, we just have to know how to handle the data. But what makes it so difficult to know when a star is about to go? Could we ever accurately predict one and watch it as it goes nova in high detail? [link] [comments]  |
| What secondary functions are there to pupil dilation/restriction? Posted: 21 Mar 2016 05:56 PM PDT As far as I know, the pupil chiefly dilates in the dark in order to get more light (while constricting when there's too much light to protect the eye). However I've heard the pupil also dilates for many other reasons, such as during a fight-or-flight response. What other things can call pupil dilation or restriction? And why? [link] [comments]  |
| How did Fermat know how to postulate his Last Theorem without knowing that it works? Posted: 21 Mar 2016 05:52 PM PDT How did he know that it holds true for any number greater than 2? Proving it is another matter but how did he come up with this in the first place? [link] [comments]  |
| If gravity is one of the weakest natural forces, then why is it the dominate force in space? Posted: 22 Mar 2016 06:45 AM PDT Orbits act and react because of gravity. Stars collapse, some into black holes, because of it. Galaxies and galaxy clusters are bound by it. How is this so if it is the, or one of the, weakest natural force? [link] [comments]  |
| Why is it a joke to ask someone to explain where layer 6 of the OSI model is? Posted: 21 Mar 2016 09:35 PM PDT I was reading this old thread and wasn't able to follow the joke. [link] [comments]  |
| Posted: 21 Mar 2016 03:38 PM PDT In a 3-dimensional space, "distances" can be easily equated between axes. If I show you a ruler lying on a table, you can easily imagine that same distance vertically. "Five miles along a road" vs "five miles above sea level" is a simple thing for people to understand. You're moving along a different axis in space, but the distances are the same and easily calculated and compared. Can the same be said for spacetime? Does "1 foot" of distance have a temporal equivalent, along a fourth-dimensional axis? Is there a Fahrenheit/Celsius conversion equivalent, wherein "1 cm = 1.394 seconds" or something similar? [link] [comments]  |
| Why does Copper (and/or Silver) Kill Bacteria, but not so much our own cells? Posted: 21 Mar 2016 03:29 PM PDT The way I under stand it, the same properties that make Copper a really good conductor also make it kill bacteria pretty effectively, so why isn't it as deadly to our cells? [link] [comments]  |
| Speed of Light? I am Confused :S Posted: 21 Mar 2016 06:09 PM PDT The speed of light is currently thought to be the cosmic speed limit, and if I understand correctly from what I have read so far; nothing with mass can travel through space at or faster than the (c) speed of light also that mass = energy. What I am having trouble understanding is, how photons are able to travel at (c)? I am confused about this because; from what I've read so far, photons carry energy which is "light", and energy = mass meaning photons do have mass. But, if anything with mass cannot travel through space at or faster than (c), how are photons able to do so? Isnt this a paradox? Forgive me if i am over generalizing things but i have just started trying to really understand the basic principles. [link] [comments]  |
| In what form is energy stored in fossil fuels? Posted: 21 Mar 2016 04:05 PM PDT When you burn fossil fuels you get heat energy, but that cant just be created from nothing so what kind of energy does just plain oil have? [link] [comments]  |
| Is it true that we've only explored 1% of the world's oceans? Posted: 21 Mar 2016 02:44 PM PDT Does that mean we've explored 1% of the world's oceans ever since humans have been around? [link] [comments]  |
| Can genes be partially-methylated? Posted: 21 Mar 2016 04:52 PM PDT For example, can a gene be 40% methylated (turned off)? Or is it like pregnancy where you are either pregnant or you aren't? edit: I am specifically interested in the AR gene [link] [comments]  |
| Posted: 21 Mar 2016 08:52 AM PDT |
| Posted: 21 Mar 2016 04:55 PM PDT I can easily understand how the electron beams of the tube scan the screen and create the image (as per the below video https://www.youtube.com/watch?v=dnrQX0OmRio which I find trully amazing) but I really cannot understand how the colors are displayed on the screen. Any simple reply will be much appreciated cause I want to explain it to my teenager son. [link] [comments]  |
| Posted: 21 Mar 2016 04:08 PM PDT We currently define a meter as a set certain length, and a second as a set certain amount of time. This means in formula like the law of gravity, we must use the Gravitational constant to make the math work. If we had different definitions for mass, length and time etc. then this constant would also be different. So could we use a 'universal set of measurements' that would eliminate the need for such constants. Downside, all future discoveries would be slightly disappointing if the scientist couldn't be able to name them after his/her self. But on the up side we wouldn't need to calculate such a constant in the first place and lazy science students with poor memory skills wouldn't need to spend so much time memorizing them. Or would changing one set of measuring units cause another set to change, meaning we will always need some universal constants somewhere? [link] [comments]  |
| Posted: 21 Mar 2016 01:35 PM PDT Dear experts and friends in /r/askscience: I am both a virtually recovered possibly high-functioning 'schizophrenia' patient and a beginning learner of cognitive neuroscience also an auditor of related courses in public universities. I am now very curious about what was wrong in my brain and my mind so that I was diagnosed, and how to manage such (past) abnormalities if they emerge again. If such set of cognitive tests/tasks exist it would be possibly helpful to diagnose/define 'schizophrenia' (an umbrella term) more systematically, and it also would be possibly helpful to rehabilitate 'schizophrenia' patients. Thanks in advance for any comments or teachings you would like to reply! P.S. keywords: cognitive neuroscience, cognitive decline, cognitive training, clinical neuroscience, clinical psychology, schizophrenia... (It seems better to use 'keywords' to categorize questions on newly developing or interdisciplinary scientific studies than a few fixed flags!) [link] [comments]  |
| If the Sun is really just a ball of gas, what keeps it from dissipating? Posted: 21 Mar 2016 02:17 PM PDT |
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