- The cosmological constant is sometimes regarded as the worst prediction is physics... what could possibly account for the difference of 120 orders of magnitude between the predicted value and the actually observed value?
- AskScience AMA Series: I am a scientist whose research could greatly increase black bean yields in Haiti - AMA!
- How we know or discern the nutriant values in the nutritional facts on foods?
- Why is cancer in the colon so much more likely than in the small intestine?
- Does a hot object in a vacuum with an emissivity gradient self propel?
- Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
- What is the meaning of the wave-vectors?
- Why is pelmatozoa no longer a classification of echinodermata?
- Does our moon have moons?
- What’s the core of the moon like?
- Does angular velocity of an object influences the gravity it generates? If yes than how?
- For animals that groom themselves, do larger individuals spend more time grooming?
- Since we have built a "planet-sized telescope" to directly image a black hole, would it be possible to get an even higher resolution image by sending up several spacecraft equipped with the same telescopes and use the same method to create an effective size of millions of kilometers?
- Can an occluded artery affect its parent-artery?
- Is there voltage on the neutral wire when a circuit is closed? Current?
- Does the primordial sound exist?
- What happens to the spectator ion in a precipitate reaction?
- How do Colloids work?
| Posted: 07 Aug 2019 02:59 PM PDT |
| Posted: 08 Aug 2019 04:00 AM PDT My name is Franky Celestin - born and raised in Haiti - I will receive my master's degree this weekend from the University of Florida's Soil & Water Sciences Department. My preliminary field work in Haiti shows the right soil management practices can increase black bean yields. (The average yield for the crop in Haiti is one of the lowest IN THE WORLD!) The next step is to conduct the research on a larger scale in Haiti beginning this fall. I'm here at 3pm ET (19 UT), AMA! [link] [comments]  |
| How we know or discern the nutriant values in the nutritional facts on foods? Posted: 08 Aug 2019 07:47 AM PDT |
| Why is cancer in the colon so much more likely than in the small intestine? Posted: 07 Aug 2019 01:32 PM PDT |
| Does a hot object in a vacuum with an emissivity gradient self propel? Posted: 07 Aug 2019 10:29 AM PDT Imagine a spherical object with mass existed in empty space with no other mass, with the object initially at rest. If this object has one side of it with a higher emissivity than the other side, and it is at some non zero temperature, will it self propel due to its radiation being biased to one side? [link] [comments]  |
| Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 07 Aug 2019 08:13 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]  |
| What is the meaning of the wave-vectors? Posted: 08 Aug 2019 04:56 AM PDT I'm reading a paper by Belov, Tretyakov and Viitanen. In this paper they discuss the dispersion properties of a wave travelling through a parallel wire medium. [ https://pdfs.semanticscholar.org/ed7a/869d4a0f71c24c7ba4ba40332259417a513d.pdf ] In the paper they start by solving for the electric and magnetic field in this infinite periodic structure as a result of current amplitudes that has a plane wave term: I_(m,n) = I exp(-j (q_x am + q_ybn + q_z z)Then the analysis continues. As I understand it the wave modes in the medium will have the wave vector q. So far so good. They solve for a dispersion equation and at some point they add floquet mode wave vector k. I don't know what they mean by this because I assumed that the wave vector q from the dispersion equation will already be the Floquet wave vector but appartently it isn't. I don't understand what specifically wave vector q and wave vector k represent individually. Normally with these band gap materials or in waveguide problems one has a wave vector that represents the wave vector that corresponds to the frequency: k=2*pi*f/c. And then you have a wave-vector of the geometry as a result of dispersion which can represent a slow wave. For waveguides this is k=sqrt(k_0^2 + eigen modes). But in this material they evantually have: q^2 = k^2 - k_0^2 where k_0 is an equivalent to the plasma frequency. So how should I go about understanding these wave vectors q and k? This gets especially confusing since in another paper that builds on this work, they use wave vectors β , β_h, β_p, k, k_inc. And I have no clue whether in this paper k = q or β = q. Thanks :) [link] [comments]  |
| Why is pelmatozoa no longer a classification of echinodermata? Posted: 08 Aug 2019 04:10 AM PDT |
| Posted: 08 Aug 2019 06:25 AM PDT |
| What’s the core of the moon like? Posted: 07 Aug 2019 12:26 PM PDT |
| Does angular velocity of an object influences the gravity it generates? If yes than how? Posted: 07 Aug 2019 12:41 PM PDT |
| For animals that groom themselves, do larger individuals spend more time grooming? Posted: 07 Aug 2019 02:20 PM PDT The surface area that needs to be groomed is going to increase with the size of the individual. So it seem logical that they may need to spend more time on the task to stay clean. For example, do large felines like tigers/lions spend more time grooming themselves than house cats due to their size? [link] [comments]  |
| Posted: 07 Aug 2019 06:05 PM PDT sub question: Is there an upper limit to how large we could make a telescope using this method? [link] [comments]  |
| Can an occluded artery affect its parent-artery? Posted: 07 Aug 2019 02:14 PM PDT Can an occluded artery cause any problems to the artery irrigating into it? Blood would attempt to flow through the occluded artery, then the clot (be a thrombus or an embolus) in that artery would stop blood from flowing, so what happens next? Will this blood be forcibly pushed back to its main artery? Does it overload[excuse my non-med background] the main irrigating artery and put it on risk of rupturing, or at least makes it deranged, consequently rupturing over time? [link] [comments]  |
| Is there voltage on the neutral wire when a circuit is closed? Current? Posted: 07 Aug 2019 03:43 PM PDT I have a decent understanding of electricity, but a discussion with one of my coworkers today got both of us thinking. We were discussing a neutral wire coming back from a load and going back to the main panel of the house. Obviously you need the neutral to make a complete circuit. But as I understand it, it is the load which draws amps through the circuit, and his point was that there was no current flowing on the neutral wire coming back from the load. On one hand that makes sense, because it's the load on the circuit that's drawing the amps. And also it's called the neutral for a reason; obviously it carries no voltage when the circuit is open, but would it still read 0 volts to ground when the circuit is closed? On the other hand, if current doesn't actually need to flow through the neutral wire in the first place, then why is it even necessary? Obviously you need a complete circuit, and I question my coworker because having no current flowing back through the neutral wire sort of makes it seem like that half of the circuit is useless; what's the point of a wire in a circuit if no current ever actually passes through that wire? And unlike a ground wire, the neutral wire is insulted, which makes me think there's got to be current moving through it. Except that, as I understand it, all neutrals in a house actually tie back into a central ground at the main panel. So why would a neutral need to be insulted, but not the ground, when the neutral wires tie back to the ground anyways? Basically, what the hell is the deal with electricity along the neutral wire? Is there current flowing, even if it's a minuscule amount? Is the voltage to ground on the neutral wire 0 even when the circuit is closed? I suppose it would have to be, considering that neutral's all connect back to the ground. As I write this I get more confused. Is there any flow of electrons through the neutral wire? If not, why's it there? [link] [comments]  |
| Does the primordial sound exist? Posted: 07 Aug 2019 11:48 AM PDT Reading about meditation sparked some interest in this subject. According to several reputable meditation centers, who don't care for the spiritually religious side of meditations, have stayed that the expansion of the universe makes a sound. This is referred to as the primordial sound and I would like to know if the actual scientific community has any backing to this idea this. TL;DR : Does the primordial sound spiritualists refer to exist? [link] [comments]  |
| What happens to the spectator ion in a precipitate reaction? Posted: 07 Aug 2019 08:01 AM PDT So i'm going to try and explain it as well as i can but i might use the wrong terms and such since english isn't my first language sorry in advance I was wondering during precipitate reactions what happens to the spectator ions. Since they do not participate in the reaction i wanted to know if they 1. Are still bonded with the other ion in the salt? 2. Regain the electrons that moved over to the other ion For example in the precipitate reaction between barium nitrate and sulfate, barium sulfate will form as a solid but what happens to the nitrate? is it still bonded with barium? Do the electrons go back to barium and bond with the sulfate? Also as a side question what exactly is the bond between the electron and the positive ion? I know it's connected and the electron is over at the negative ion but what force is keeping them together? [link] [comments]  |
| Posted: 07 Aug 2019 08:04 AM PDT I understand that they are molecules that are used in mixtures to create a sort of "gelling" but is it because how they are arranged or due to specific bonds? How does its presence actually cause particles from not being able to settle? [link] [comments]  |
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