Does the glass on a smartphone screen get thinner over time the more you touch it?

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• Does the glass on a smartphone screen get thinner over time the more you touch it?
• Where is the line drawn for what counts as one molecule? Is a full strand of DNA one molecule? Is the membrane for the nucleus?
• I've heard grapes have more "coding genes" than humans. Do the human coding-genes form some kind of sub-set or overlap of the grape, or are the coding regions of the DNA/(genome?) completely different?
• Is Dark Energy a property of spacetime? Can Dark Energy be attributed to the Casimir Effect? Why use Mpl/(Lpl)^3 to discredit QFT explanations of DE? AND MORE!
• Are there galaxies without a black hole in the center?
• How the Schwarzschild Radius Formula was found ?
• [Mathematics] What type of counting system do we use for time?
• what is the concentration of fluoride require to prevent bacterial proliferation?
• What does the molecular structure of titanium look like? I can't seem to get a definitive answer using Google.
• Why are the graphs of some functions not a single line?
• How can I calculate the optimal path for a particle through a set of points?
• How is it that scientists can say that there are more dimensions than our own? What proof is there and where can I find it?
• If we have the technology to image the handful of individual stars as they closely orbit around the black hole at the center of the Milky Way, why hasn't there been a concentrated effort to map all stars on our half of the Milky Way?
• What is so big about absolute zero?
• Why don't grains of salt stick together, if they are formed through ionic bonds?
• [Physics] Is it possible that the information in the brain survives death? Sean Carroll says we know and understand every particle/force/field that *could* interact with the brain. As a result, if this information were being carried away after death, we could detect it.
• Why are there waves in this water?
• I have a hula-hoop of power cable. If I turn it (fastly) around me, can I induce a current? Does this induce a magnetic field? How much energy could I produce/convert?
• What is the Grand Unified Theory?
• Is there a map of the known universe as it "is" vs what it "was"?

Does the glass on a smartphone screen get thinner over time the more you touch it? Posted: 16 May 2016 09:46 AM PDT submitted by /u/chw3 [link] [comments]

Where is the line drawn for what counts as one molecule? Is a full strand of DNA one molecule? Is the membrane for the nucleus? Posted: 17 May 2016 05:14 AM PDT submitted by /u/omegasavant [link] [comments]

I've heard grapes have more "coding genes" than humans. Do the human coding-genes form some kind of sub-set or overlap of the grape, or are the coding regions of the DNA/(genome?) completely different? Posted: 16 May 2016 05:40 AM PDT My question may not even make sense, because I think of the huge lists of base pairs being kind of like a book with ordered pages, which may not be the case. But the idea that a grape is more genetically flexible or 'powerful' than us raises so many interesting questions in my (layman's) head: Could you culture a grape (with perfect gene editing and knowledge) to be a human, but not the other way around? Have the non-coding genes been found to have more function than 'junk' DNA? How did the grape get more coding genes, anyway? Are there generally more coding genes in plants or mammals? Seems counter-intuitive, but then I suppose a mouse is more similar to a human than grass is to a pineapple? Sorry for the ramble. The main question I have is: Do the "coding genes" fall in roughly the same locations along the genome? submitted by /u/isaidthisinstead [link] [comments]

Is Dark Energy a property of spacetime? Can Dark Energy be attributed to the Casimir Effect? Why use Mpl/(Lpl)^3 to discredit QFT explanations of DE? AND MORE! Posted: 16 May 2016 07:15 PM PDT Hey guys, I've now wasted my day off exploring our limits of understanding about Dark Energy and now have some questions that, hopefully, you wonderful people can answer for me. For reference, a good chunk of these questions arise from watching Professor Ed Copeland talk about Dark Energy in this video Professor Copeland makes some assertions about Dark Energy: It's uniformly spread across the entire universe (its smooth). It's always been smooth (evenly distributed) It is not the dominate force in the universe but it will be due to the expansion of the universe. (energy density of matter and radiation drops as space expands) It weak in local systems with high mater density and strong in systems without a high matter density On to my questions: 1) Is Dark Energy a property of space-time itself? If DE is uniformly distributed, has always been uniformly distributed, and does not lose energy density as space expands, does this not spell out that space-time expands 'on its own'? It seems to me that the properties of DE are so different from matter or radiation in how they propagate across the universe that DE can't be a 'thing' but rather a property of how space-time acts. 2) If Dark Energy is a property of space-time, why not attribute it to the Casimir Effect? So this question is a little loaded because I know that most physicists would point out that the Casimir Effect is ~7.2x10122 times stronger than DE seems to be. Lets just put that notion aside for a second (don't worry I'm coming back to it). The Casimir Effect is what happens inside a vacuum where particle pairs are spontaneously created from residual energy of the vacuum. These particle/anti-particle pairs are created for only brief periods of time (so short that they are referred to as virtual particles) but still exert a force on the system. Since the Casimir Effect is a property of space-time and will exert pressure, it seems like a great candidate for what DE is. 3) When asked why vacuum energy (Casimir Effect) doesn't explain DE, physicists say its too powerful and give an approximation on the Planck scale as verification As the linked comment shows (I've seen a similar explanation in many other places as well), the classic rebuttal to vacuum energy is that its just way too strong. My problem is why in the world do we use mp/lp3 to explain why it is too strong. The Planck mass (mp) is the highest possible mass for a single-charge quanta and we are dividing it by the smallest possible volume? Why not use a mass of a proton or something much closer to what kind of particles the Casimir Effect produces? To me, if we divide the largest mass possible of a particle by the smallest volume that particle can occupy, of course we're going to get an extremely large number. I guess the question is: why is mp/lp3 used to estimate the Casimir effect? Another thought of mine is: can we work backwards from the strength of DE to find what the Casimir Effect must produce to be similar/analogous to DE? Would this produce a viable result? Tagging on to this, could particles that have m>mp interact with each other to form black holes, thus minimizing the net force of the Casimir Effect? Would these black holes have to evaporate (radiate away) extremely quickly to be viable? 4) If DE can't be contributed to the CE, are there any thoughts on whether space will expand on its own when given energy? I still struggle with DE being something other than a property of space-time so I'm gonna follow that logic train for a bit. Could space-time itself be 'self expanding'? "Empty" space will spontaneously create particles, is there any reason not to think that it could also self-expand with the energy it has? Or maybe space-time is self-repelling? This question is similar to #1 but focuses on space being self-repelling or self-expanding specifically 5) OK, one last question and then I'll be quiet, promise. Why is a 'big-rip' a possibility with our understanding of DE? DE is weak with high matter density systems (eg galaxy, solar system, moon systems, handshakes, etc) so how is it theorized that DE will overcome the strength of gravity and the other 3 forces? I understand local clusters drifting apart and galaxies drifting away from one another, but our galaxy is already held together by gravity. How is DE supposed to break up the milky way if the gravitational forces are too strong for DE to expand the galaxy as is. I guess a better way of putting it is: is our (or any) galaxy expanding due to DE already? If so, why isn't gravity preventing that expansion, isn't gravity currently too strong for DE to 'gain its momentum' and break up the galaxy? Okay, that was really long, I apologize. I don't expect anyone to answer all the questions, but if you're willing to answer one or more, I'd be very appreciative for your time and investment in my learning. PS: The bullet points are more or less my thought process behind each question so that you can get a better feel of where I'm at. submitted by /u/DirtyJesus1 [link] [comments]

Are there galaxies without a black hole in the center? Posted: 17 May 2016 03:37 AM PDT submitted by /u/itendtosleep [link] [comments]

How the Schwarzschild Radius Formula was found ? Posted: 16 May 2016 10:22 AM PDT I was wondering if anyone could explain how Karl Schwarzschild ended up on this formula( R=2GM/c2) for the Radius to which you must reduce a object to make it a black hole . From what did he started ? submitted by /u/matoussa71 [link] [comments]

[Mathematics] What type of counting system do we use for time? Posted: 16 May 2016 11:09 AM PDT A little googling tells me its a sexagesimal (base 60 counting system) which to me fits fine enough for seconds and minutes, but when you include <microseconds and hours and days and such it becomes more complicated. I would call it a hybrid counting system, base ten for the first digit, base 6 for the second digit, twelve for the next two digits and so on and so forth. Is there an actualy term for this kind of counting system? submitted by /u/Sman6969 [link] [comments]

what is the concentration of fluoride require to prevent bacterial proliferation? Posted: 16 May 2016 07:12 AM PDT I also realize it could depend on the bacteria. So I also want to know how much. Maybe its almost none maybe its a lot. Chose chemistry since ''biochemistry'' included. I guess cellular biology would not be far either. submitted by /u/LOST_TALE [link] [comments]

What does the molecular structure of titanium look like? I can't seem to get a definitive answer using Google. Posted: 16 May 2016 02:31 PM PDT I tried Googling titanium molecular structure to mixed results, depending on the type of Titanium. Here's the thing, I don't know what I'm looking for except that I have one titanium implant in my left ear and some titanium screws in my C spine. I'd like to use the molecular structure in a piece of artwork I'm working on, but I'm not sure which one I should use. Any ideas? submitted by /u/12084182 [link] [comments]

Why are the graphs of some functions not a single line? Posted: 16 May 2016 05:30 PM PDT The graphs of some functions are divided into individual lines, such as the graph of the tangent function, secant function, cosecant function, and cotangent function. In the case of tangent and cotangent, the graph looks like several lines that curve deeper the closer x approaches zero, and by mathematical law they will never touch. The same goes for secant and cosecant, only this time the graph of both resembles a layout of multiple parabolas whose vertex has an absolute value of 1. Just like tangent and its reciprocal, the individual lines that make the graph never touch each other. In general, the graph of each of these functions is broken up into individual lines. My question is, why? Why aren't the graphs of these functions (and so many more) united as a single line? submitted by /u/4w350m3guY [link] [comments]

How can I calculate the optimal path for a particle through a set of points? Posted: 16 May 2016 07:41 PM PDT Given a set of points on a 2D plane, and assuming no friction, how would I go about finding the quickest (or at least a close to optimal) path for a particle through these points assuming that I can change the angle of acceleration as well as the amount of acceleration up to a constant. For example, say I am flying a rocket and I want to get from point A through point B to point C. I can control which way the thruster is oriented and I can change the thrust value from 0 to k: - - - - - - - - - - - - - - - B - - - - A - - - - - - - - - - - - - - - - - C - - - - - - - - - - - The optimal path would be some sort of curve from A to C passing through B. What sort of a curve am I looking for and how could I calculate it? Even some search terms and suggestions would be useful. submitted by /u/Russian-Assassin [link] [comments]

How is it that scientists can say that there are more dimensions than our own? What proof is there and where can I find it? Posted: 16 May 2016 09:28 PM PDT submitted by /u/affinityforskunks [link] [comments]

If we have the technology to image the handful of individual stars as they closely orbit around the black hole at the center of the Milky Way, why hasn't there been a concentrated effort to map all stars on our half of the Milky Way? Posted: 16 May 2016 04:54 PM PDT If we can precisely image these stars which are 25k light years away, then shouldn't it be possible to precisely determine the position of all stars within 25k light years? That would equal half our galaxy. submitted by /u/woofwoofwoof [link] [comments]

What is so big about absolute zero? Posted: 17 May 2016 05:12 AM PDT What kind of advancement(s) would be made if we were to reach it, which I know can not be done submitted by /u/720no_scope [link] [comments]

Why don't grains of salt stick together, if they are formed through ionic bonds? Posted: 16 May 2016 09:21 AM PDT Also why does Na and Cl form crystals? submitted by /u/Mir3al [link] [comments]

[Physics] Is it possible that the information in the brain survives death? Sean Carroll says we know and understand every particle/force/field that *could* interact with the brain. As a result, if this information were being carried away after death, we could detect it. Posted: 16 May 2016 10:53 AM PDT Is it possible that the information on the brain survives death? Sean Carroll claims that although there is a lot of physics we don't understand, we know and understand every particle/force/field that could interact with the brain. As a result, if this information were being carried away after death, we could detect it. He says (in the video below) that if this mystery particle existed you would be able to collide the particles that make up the atoms of the brain and it would generate this mystery particle. He shows rotating a Feynman digram to demonstrate this idea. Here is a link to a recent article where he mentions it: http://www.npr.org/sections/13.7/2016/05/15/478143589/fear-of-knowing Here is a link to an older video where he goes into much more detail: https://youtu.be/Vrs-Azp0i3k If he is right, why isn't this more widely discussed? If he is wrong, I want to understand why. Thanks for sincerely evaluating this. submitted by /u/BeakOfTheFinch [link] [comments]

Why are there waves in this water? Posted: 16 May 2016 08:34 AM PDT Somehow, the people in this video are riding the very first wave just behind completely still water. https://youtu.be/GmBWvF6-4DQ?t=155 What could possibly cause this uniform wave pattern that has a beginning? submitted by /u/TechnoL33T [link] [comments]

I have a hula-hoop of power cable. If I turn it (fastly) around me, can I induce a current? Does this induce a magnetic field? How much energy could I produce/convert? Posted: 16 May 2016 08:36 AM PDT Let's treat this like a physics problem in school, so please assume a spherical power cable in a vacuum. This question could be really dumb... if so, please explain why. Will it work similar to a dynamo? submitted by /u/DeutschLeerer [link] [comments]

What is the Grand Unified Theory? Posted: 16 May 2016 05:42 PM PDT Hello all, I am doing a presentation on the Grand Unified Theory and I am wondering if there is any essential information I should include? Also is there any basic analogy I can relate to this theory to give the class I am presenting to a better understanding of the topic? Thanks in advance. submitted by /u/jonnyfolsom [link] [comments]

Is there a map of the known universe as it "is" vs what it "was"? Posted: 16 May 2016 05:47 AM PDT Every time I see that cool 3D map of the universe, it is prefaced with, "we are looking into the past". While that's cool and all, we do know the location, approximate distance, and approximate direction of travel and speed. Has anyone ever "advanced" the map to where everything is (or should be) positioned today? submitted by /u/ABrownCoat [link] [comments]

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