They say that to test String Theory, we need to build a particle accelerator as large as out galaxy. Is it a technical limitation or a fundamental one? |
- They say that to test String Theory, we need to build a particle accelerator as large as out galaxy. Is it a technical limitation or a fundamental one?
- Why do I feel like I need to cough when I stick a q-tip in my ear?
- Why do we have to kill a horse when it broke its leg? What is the difference in biological processes between man and horse in bone mending?
- How dangerous is uranium/uranium oxide to handle?
- Light beam propulsion without lasers?
- Why does boiling water make so much sound?
- Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
- Where do prions originate from?
- Can air "hold" alcohol (ethanol) like it can water at room temperature?
- Can we only detect planets in systems that we see edge on?
- If you stacked a lot of microscopic organisms, would you eventually be able to see them? What would they look like?
- Why should death from dehydration have to be so suffering?
- What happens on an atomic scale when water is boiled?
- Use of the delta function in QM?
- [Physics] How do whispering gallery mode resonators in lasers work?
- how does chirality come into play when manufacturing pharmaceuticals?
- How does the weak force works ?
- What makes some adhesives reusable and some useless unless reapplied?
- If I aim a 'typical' laser-pointer into the night sky, assuming no clouds, how far will it travel/be detectable into space?
- Can swordfish see their own bill?
- What in the human anatomy of fingers makes it easier to get a ring on than off?
| Posted: 17 May 2017 10:09 AM PDT |
| Why do I feel like I need to cough when I stick a q-tip in my ear? Posted: 17 May 2017 01:32 PM PDT I know you're not supposed to do it, but I still do. When I stick a Q-tip in my ear, I get this overwhelming urge to cough. Why is that? [link] [comments]  |
| Posted: 18 May 2017 03:12 AM PDT |
| How dangerous is uranium/uranium oxide to handle? Posted: 17 May 2017 08:40 AM PDT At 38:55 of the below video, it is said that people wear gloves when handling uranium to protect the uranium from being contaminated, rather than wearing gloves to protect themselves from the uranium. It is said that since uranium's half-life is in the billions of years, it isn't that radioactive. This sounds hard for me to believe, as I thought uranium was very dangerous to handle. Is it true that uranium isn't that radioactive? That gloves are worn to protect the uranium, and not the human? Also, is uranium oxide - which is what the pellets in the video are - the same as uranium in terms of safety? [link] [comments]  |
| Light beam propulsion without lasers? Posted: 18 May 2017 05:57 AM PDT We now have the capability to do laser launch. The problem is the initial cost outlay for the lasers is still prohibitive to launch a sizable payload. The estimate of the payload you can launch to Earth orbit dependent on laser power is about 1 kg per megawatt. So to launch thousand kilo payloads would require a gigawatt laser power levels. At current prices this would cost billions of dollars. But is it possible to do it without using lasers, just using high intensity noncoherent light focused by mirrors or lenses? I wondered about this because of two reports I saw doing a web search actually on optical communication: InfiniLED MicroLEDs achieve 300 W/cm2 output density from tiny source. The MicroLEDs semiconductor manufacturing process includes construction of a parabolic reflector to enable optimal light control and high efficiency from micro-meter-sized LEDs. Published on:Jan 29, 2013 By Maury Wright and: Optical communications using coherent and non-coherent light. http://modulatedlight.org/optical_comms/optical_about.html The first report discusses micro-scale LED's whose light output scales up to 300 W per square centimeter, 3 megawatts per meter. From the appearance of these micro-scale LED's, they should permit simple automated production to produce many copies to cover a macro-scale area to generate light even at gigawatt power levels. The second report discusses experimentation that suggests atmospheric dispersion is actually worse for lasers than for noncoherent light generated by LED's. See for instance the video in Fig. 2 on this page. The advantage of the lasers however is that generating a parallel beam, you can use a parabolic mirror to focus the light at the focal point (more precisely at the Airy disk). Still, nevertheless a parabolic mirror will still focus a large portion of the light at the focal point even for noncoherent light. So the question is if the beam is noncoherent, how much of the light can still be focused at the focal point (Airy disk)? [link] [comments]  |
| Why does boiling water make so much sound? Posted: 18 May 2017 03:52 AM PDT |
| Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 17 May 2017 08:04 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Biology, Chemistry, Neuroscience, Medicine, Psychology Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| Where do prions originate from? Posted: 17 May 2017 08:53 PM PDT |
| Can air "hold" alcohol (ethanol) like it can water at room temperature? Posted: 17 May 2017 08:30 PM PDT Hey guys. I know this question highly depends on the temperate and probably air pressure or something, so lets say typical summer day, 25°C (=77°F or 298,15°K), normal pressure. I place a bowl of pure alcohol in a room. Will alcohol "go" into the air like water would? (Sorry for the words in "", I'm from germany and english isn't my native language so i was missing a few vocabularies :> ) [link] [comments]  |
| Can we only detect planets in systems that we see edge on? Posted: 17 May 2017 05:13 PM PDT I've heard that we use the transit method for identifying planets passing in front of stars. Does this mean that we can only detect planets if their orbital plane is along our line of sight? [link] [comments]  |
| Posted: 17 May 2017 07:28 PM PDT Assuming they don't move or run away, what would happen if you stacked (or piled up) a lot of microscopic organismic or just microscopic "things" in general. Disregarding the improbability/impossibility of finding that many of the organism, would you eventually pile up enough to be able to see them? Would it look like a solid mass? Bonus: what would it feel like? [link] [comments]  |
| Why should death from dehydration have to be so suffering? Posted: 17 May 2017 07:12 PM PDT I have heard that dying from dehydration is one of the most uncomfortable and gruesome death possible. I understand some aspects on why a person would show symptoms because it is the body's way of warning the user. However, if a person is severely dehydrated then the body should just accept that the person is probably stuck somewhere that has no water. The body should release large amount of endorphin and make the death as serene and comfortable as possible instead of having the person suffer through death. I do not understand this from a biological standpoint since starvation has the body release endorphins after a while since it recognizes that death is inevitable. [link] [comments]  |
| What happens on an atomic scale when water is boiled? Posted: 17 May 2017 11:55 AM PDT So my college entry biology professor (with a doctorate) just told my summer school class that when water boils, the hydrogen and oxygen atoms split and bind to each other, forming H2 and O2. I have always been taught that water vapor is just water molecules that are heated to a gaseous form. Also, if what he said is true (which at this point, I have trouble believing) than why does the ensuing H2 gas and O2 gas not react with my kitchen stove and blow my house apart when I do something like cook pasta? [link] [comments]  |
| Use of the delta function in QM? Posted: 18 May 2017 04:44 AM PDT I've only ever come across this function in Control Engineering for system response, however I think I remember someone in another thread mentioning its use in quantum mechanics, can anyone tell me how it is used in that field? Thanks [link] [comments]  |
| [Physics] How do whispering gallery mode resonators in lasers work? Posted: 18 May 2017 04:31 AM PDT How do they work and how are they able to get ultra narrow linewidth, high Q factor? Links to articles, journals or books are highly appreciated. Thanks in advance. [link] [comments]  |
| how does chirality come into play when manufacturing pharmaceuticals? Posted: 17 May 2017 10:10 PM PDT I understand what it is I just dont get how a mirror of a molecule would come into play. are they connected? do they come in pairs and the other molecule has to be flushed out? does it just happen by accident that a molecule chiral partner slips into the mix and isnt easily spotted because of its likeness? please explain. [link] [comments]  |
| How does the weak force works ? Posted: 17 May 2017 11:53 PM PDT I manage to understand the other 3 interaction but the weak force still remains a mystery, i was wondering if you van answers these following questions: 1. What are the mechanism of the weak force ? 2. What field of boson transmit it ? 3. How does the weak force affect our lives ? 4. Can or Have we harnessed the weak force in any way ? [link] [comments]  |
| What makes some adhesives reusable and some useless unless reapplied? Posted: 17 May 2017 06:53 PM PDT In the case of sticky notes, they can be stuck several times before losing their "stick", while things like super glue stick once and never again. [link] [comments]  |
| Posted: 17 May 2017 06:40 PM PDT Obviously I know this depends on the sensitivity of the object "detecting it" but in general how far would a laser-pointer pointed into the sky get before it could no longer be detectable. If it's necessary to put a metric on it "how far until the human eye would no longer notice its presence?" [link] [comments]  |
| Can swordfish see their own bill? Posted: 17 May 2017 03:32 PM PDT |
| What in the human anatomy of fingers makes it easier to get a ring on than off? Posted: 17 May 2017 11:17 AM PDT |
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