Why are there many different types of fuel (87, 93, diesel) and why can certain machines take only one type? |
- Why are there many different types of fuel (87, 93, diesel) and why can certain machines take only one type?
- How do we designate stellar areas?
- Why inbreeding animals causes so much harm to offspring, but it is not the case in case of plants?
- Since dolphins are mammals, is it possible to milk them?
- Electrical Muscle Stimulation (EMS) prevents muscle atrophy by causing muscles to contract. Why aren't we using this in hospitals and homes if immobility is such a problem for the older generation, disabled, or bedridden?
- How can a GPS receiver manage to pick up on a signal that's 10 orders of magnitude weaker than background noise?
- How does viewing an image or flash trigger a seizure?
- How do headphones change volume, whether plugged in or with Bluetooth? If the electrical energy is changed into sound, does the amplitude and strength of the electricity determine the volume?
- How soon into a chess game could a computer calculate that you’re destined to lose?
- Tobacco plants have been genetically altered and are now 40% more productive. How can such an old evolutionary process as photosynthesis be inefficient?
- What if two oppositely spinning black hole ergospheres came into contact?
- When the Earth's equilibrium temperature increases, do the amounts of radiation absorbed and emitted by the Earth also change?
- Is it possible to get two different colds at the same time?
- How and why are teeth used to identify murder victims?
- What are "non-reliable" vegan sources of B12?
- How do they calculate the 1.5B ly distance from the source of the recent fast radio bursts (FRB) received from space?
- What is the significance of an 7 nm node and what happens when we can’t go any smaller?
- How can this visual illusion be explained biologically? What is happening to the eyes?
- How is sound, decibels, loudness, and intensity related?
- Is there a particular reason that we use virtualisation in computers and servers?
- What happens to an interferometer moving relativistically fast?
- What are the chances animal larger than blue whales ever existed ?
| Posted: 10 Jan 2019 02:34 AM PST |
| How do we designate stellar areas? Posted: 10 Jan 2019 04:21 AM PST Just some curiosity about the correct terms. If you're speaking about a planet it's: Earth in the Sol system. How do we differentiate locations on moons of planets? Is it "Moon base 6 on Luna near Earth?" Or "Moon base 6 in the Earth neighborhood?" [link] [comments]  |
| Why inbreeding animals causes so much harm to offspring, but it is not the case in case of plants? Posted: 10 Jan 2019 08:38 AM PST I am curious what are the reasons that inbreeding animals leads to the higher probability of many genetics disorders, but it seems not to affect well-being of plants? Or am I wrong here and inbreeding plants also damages DNA of next generations, but maybe less, than these of animals? Also as far as I know number of chromosomes in plants can vary with no or little effect on them. Why is it like that? Would that be on of the reasons why inbreeding is not dangerous to plants? [link] [comments]  |
| Since dolphins are mammals, is it possible to milk them? Posted: 10 Jan 2019 06:00 AM PST |
| Posted: 10 Jan 2019 07:42 AM PST |
| Posted: 09 Jan 2019 08:51 PM PST |
| How does viewing an image or flash trigger a seizure? Posted: 10 Jan 2019 08:37 AM PST |
| Posted: 10 Jan 2019 07:48 AM PST |
| How soon into a chess game could a computer calculate that you’re destined to lose? Posted: 09 Jan 2019 06:23 PM PST |
| Posted: 10 Jan 2019 02:27 AM PST If I understand this paper* correctly, it is said that photosynthesis in C3 plants is really inefficient. Specifically the photorespiration part where carbon is transformed in CO2 again. Scientists see this as a waste of energy, and it has now been improved by constructing "a metabolic pathway in transgenic tobacco plants that more efficiently recaptures the unproductive by-products of photosynthesis with less energy lost [...]. In field trials, these transgenic tobacco plants were ∼40% more productive than wild-type tobacco plants." How can we be so sure photorespiration is an inefficient process? Isn't it more logical that we don't fully grasp the complexity of the process yet? I mean it had billions year to evolve, it must have a benefit to do it this way right? (This is not my field of expertise, so if I'm saying things wrong, please correct / teach me.) [link] [comments]  |
| What if two oppositely spinning black hole ergospheres came into contact? Posted: 09 Jan 2019 08:36 PM PST Is there a precise cut-off point for the edge of the ergospheres, and would it destroy whatever was directly between them at point of contact? And what if the rotating black holes moved closer together so the ergospheres overlapped, leaving a venn diagram shape ? Assuming the rotational speed and mass are the same, would the ergospheres cancel out and create a normal region of space-time? [link] [comments]  |
| Posted: 10 Jan 2019 07:08 AM PST I'm pretty terrible at science, but am trying to learn a little bit about climate change. Something that I've been struggling to understand is the concept of equilibrium temperature. I know that the Earth's equilibrium temperature is the temperature at which the Earth is absorbing and emitting the same amounts of radiation. And I know that the equilibrium temperature increases, as the amount of greenhouse gases in the atmosphere increases. What I'm curious about is this - do the amounts of radiation absorbed and emitted by the Earth also increase, when the equilibrium temperature increases? Or do both of those values remain constant? It seems to me like the amount of radiation absorbed by the Earth would increase, because the increased amounts of greenhouse gases in the atmosphere means that more IR is being absorbed. But I'd like to have someone confirm whether or not this is accurate. Thanks! [link] [comments]  |
| Is it possible to get two different colds at the same time? Posted: 09 Jan 2019 11:32 AM PST |
| How and why are teeth used to identify murder victims? Posted: 10 Jan 2019 06:46 AM PST You hear from the media that sometimes the murderer(s) cuts/burns the fingers of the victim and remove their teeth to make them unidentifiable. I understand that fingerprints (and also teeth) are unique and that the government has a database of fingerprints (I remember in primary school the policemen came to take our fingerprints but teeth...? How does the government identify you through your teeth? Does the government have some sort of database? How do they get your teeth 'data'? [link] [comments]  |
| What are "non-reliable" vegan sources of B12? Posted: 10 Jan 2019 06:25 AM PST Most articles on B12 suggests that the only reliable vegan sources of B12 are foods fortified with B12. E.g https://www.vegansociety.com/resources/nutrition-and-health/nutrients/vitamin-b12/what-every-vegan-should-know-about-vitamin-b12 This implies there may be unreliable sources. As B12 is only produced in nature by certain bacteria, and archaea, surely some fermented foods will contain B12? Why is this unreliable? [link] [comments]  |
| Posted: 10 Jan 2019 02:21 AM PST |
| What is the significance of an 7 nm node and what happens when we can’t go any smaller? Posted: 09 Jan 2019 02:36 PM PST I read that AMD announced a 7nm GPU. What does "7nm architecture" mean and why that over a larger number? Also, what happens when we can't go any smaller? I heard at one time people thought anything smaller than 10 was impossible. [link] [comments]  |
| How can this visual illusion be explained biologically? What is happening to the eyes? Posted: 10 Jan 2019 02:08 AM PST Does this have to do with the brain filling in the colors while still focused on the dot? And why does the illusion cease to work once you look away from the dot? Does this have anything to do with the thresholds of the rods and cones in the eye? Thanks in advance! [link] [comments]  |
| How is sound, decibels, loudness, and intensity related? Posted: 10 Jan 2019 05:33 AM PST Sorry for the somewhat misleading title, but here's the jive. I'm a natural resource manager, not an acoustics expert and need help in writing a rebuttal to the following comment, which has been slightly edited:Vehicle A produces 68 decibels and Vehicle B produces 78 decibels. The decibel scale is logarithmic, therefore sound from Vehicle B at 78 decibels is 10 times louder than Vehicle A emitting 68 decibels. Sound emissions from more than one source have an additive effect. Therefore, if there are 4 Vehicle Bs emitting 78 decibels the total sound impact on the listener is 84 decibels (6 more decibels than a single Vehicle B). 10 Vehicle Bs in a group will create 10 more decibels than a single Vehicle B. 10 Vehicle Bs, each emitting 78 decibels, will produce a combined sound impact of 88 decibels, or 100 times that produced by a car emitting 68 decibels. Research on the mitigation of road noise indicates that a distance of 1000 feet is needed to reduce road noise by 10 decibels (further arguments will use this distance as a standard to reduce road noise for simplicities sake although it is a much more complicated matter). The 1000-foot mitigation zone reduces the sound of one Vehicle B emitting 78 decibels to that of one Vehicle A emitting 68 decibels. Here's what I essentially need help answering and gaining a basic understanding of: 1) Is 78 decibels 10 times louder than 68 decibels? 2) I know that sounds can have an additive effect, but only when all sound sources have the identical sound/similar frequencies. So, I'll assume that all Vehicle As emit the same frequency and that all Vehicle Bs emit the same frequency and that the two are distinctly different from one another. However, do 10 Vehicle Bs in a group produce 10 more decibels (88 decibels) than a single Vehicle B (78 decibels)? 3) Is 88 decibels 100 times louder than 68 decibels? 4) Assuming the 1000 foot mitigation zone is correct, if a person was standing 1000 feet away would the sound from Vehicle B be reduced to the sound of Vehicle A if you were standing next to it? A scientific and basic response to each question would be appreciated. Thanks for all the help because this is way outside of my realm! [link] [comments]  |
| Is there a particular reason that we use virtualisation in computers and servers? Posted: 09 Jan 2019 08:22 PM PST I know that there are benefits to security using virtualisation in such that the computers can`t infect each others and that it is easy maintenance. But isn`t the fact that running computers inside a computer (multiple OS`s inside an OS) a big bottleneck when it comes to performance? [link] [comments]  |
| What happens to an interferometer moving relativistically fast? Posted: 09 Jan 2019 09:41 PM PST Say you have a Michelson interferometer with one leg in line with the motion of a spaceship and the other leg perpendicular to it. As the leg in line with direction of travel Lorentz transforms, would the fringes look different? [link] [comments]  |
| What are the chances animal larger than blue whales ever existed ? Posted: 09 Jan 2019 09:43 AM PST The blue whale is the largest animal to have ever lived, as far as we know. But how likely is it that there were some larger animals in the past we know nothing about ? Considering how large some kinds of animals could get during some geologic periods (like amphibians during the Carboniferous, then dinosaurs during the Mesozoic, etc), do scientists assume that there was a period when it's likely that creatures larger than those of our time lived in the ocean ? Is there a limit as to how large an animal can get ? [link] [comments]  |
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