| Do generations of dogs understand relation to their descendants? Like, would a ‘grandpa’ dog know his relationship to a new puppy ‘grandson’? Posted: 22 Jan 2022 08:10 AM PST Saw a post in r/aww about a grandpa/grandson dog/puppy combo playing. Brought up the thought in the title. I understand genetic memory & have seen studies of generations of mice being afraid of the same thing the first generation was trained to be scared of, but I'm thinking more of the anthropology aspect of it. Do other animal species have the ability to form these concepts? submitted by /u/CongressmanForSale [link] [comments] |
| What are the gravity related functions of the human body and how they are effected and overcome in a zero gravity environments? Posted: 22 Jan 2022 07:39 AM PST |
| How can a mutation in an intron affect the gene? Posted: 22 Jan 2022 05:32 AM PST |
| Is there a terminal velocity for a buoyant object rising through liquid water? Posted: 22 Jan 2022 10:06 PM PST |
| How does an axial compressor create more pressure? Posted: 22 Jan 2022 11:28 AM PST I'm actually in the math-heavy design stage to build an actual mini axial gas turbine. There are reasons why a centrifugal one is used as part of a turbocharger, but the scientific challenge really got to me. I'm even building an extra 4-axis lathe to mill the blisks for it. Anyways. I have no problems with the design of the blades or the velocity triangles. BUT EVERY book about fluid dynamics or turbomachinery OMITS THE EXACT causal link of how a stator (if the compressor is of such design) creates pressure. It usually vaguely talks about the stator being a diffusor, but on the same time the flow area of the annular stream continually grows smaller and smaller through the compressor. In other words: How does it work that a flow is diffused (subsonic design) and at the same time the flow area is reduced. Obviously this can't work the way I describe the question, but the phrasing of the question is well formed to exactly depict how much I understand and what's still missing. So, what exact characteristic of the stator (is it the curvature, the thickness, the nozzle spatial geometry,...) causes the pressure to rise from the velocity AND how do I bring this in accordance of the steady reduction of flow are throughout the compressor? I REALLY appreaciate an answer as not even fluid dynamic books really get this specific and just generalize that point. submitted by /u/eternal1000milestare [link] [comments] |
| After the human immune system is already activated, does it matter if new virus is continually being fed in? Posted: 22 Jan 2022 01:16 PM PST If we pretend there are two people, each located in a seperate room, who are both infected with the COVID-19 virus. Their immune systems have activated and their bodies are now fighting the infection. Now pretend that a vent is pumping further COVID virus particles into the air for just one of the rooms. My question is, should we expect the severity or recovery timeline of the disease to be impacted for the person in the room getting a continuous feed of new/additional virus particles via the vent? Why or why not? submitted by /u/FracturedAscendancy [link] [comments] |
| Why is it important to conserve independent subspecies/populations separately, especially within critically endangered species? Posted: 22 Jan 2022 11:34 AM PST Take tigers for example. There are several distinct subspecies and populations, all of which are endangered. I know that each population would have evolved to adapt to their specific environments. The Siberian Tiger and the Sumatran Tiger would have evolved to be comfortable in different climates and environments. So I understand not just tossing any two tigers together. But why is it crucial not to introduce genes from the Malayan tiger into Sumatran tiger populations? In each native range, the tiger fills an important ecological niche, so wouldn't SOME tigers, even if they're "mixed breed" be better than no tigers at all? And before populations became so fragmented, wouldn't there have been significant overlap and interbreeding on the edges of each population's range? Any help dumbing this down for me would be much appreciated! submitted by /u/maybekindaodd [link] [comments] |
| How does the HPV virus create warts and verrucas? Posted: 22 Jan 2022 01:32 AM PST Since the topmost layer of skin is dead skin cells, and a virus needs living cells to create more of itself, how does it infect the skin? submitted by /u/Memedonkster [link] [comments] |
| Can orbit be understood as gravity and centrifugal force cancelling out? Posted: 22 Jan 2022 07:24 AM PST Generally, when popular science outlets try to explain an object being in orbit simply, it is explained as "constantly falling and constantly missing" or similar. I can kind of see what they mean when they put graphics of it up, but it's in no way intuitively easy. My thought before I saw that explanation was simply that gravity and the centrifugal force from rotating around the planet/star/etc. cancelled out, and hence the object stays in the orbit and experiences net zero acceleration/gravity. Does the math support this interpretation? If it does, is there anything else with it that is incorrect, or is it just different ways of thinking of the same thing? submitted by /u/A_number-1234 [link] [comments] |
| What does it mean to say that "our skin perceives infrared as heat"? Posted: 22 Jan 2022 11:20 AM PST So I've heard this many times before in the context of astronomy and JWST and I realized that I don't quite understand the implications of this statement: "we perceive infrared as heat". Our eyes see visible light frequencies, we have detectors that capture this visible light emitted from far away and our brains process it and that's how we see the environment around us. But about our perception of infrared as "heat": - Stars/flames that burn hotter appear blue, stars that are colder appear red. Does this mean blue stars emit less infrared and more visible light, or they also emit more infrared but we just can't see it with our eyes? Since infrared is heat and blue stars are hotter, I would expect more infrared from blue stars. Does this mean the blue objects also emit more red but the blue overwhelms the red? Or is "heat" and "hot temperature" not actually the same thing in this case?
- Our skin "feels" infrared as "heat". But does our skin only detect infrared by direct contact, so we have to be touching something to feel that it's "hot" and tense its temperature? Or does it also detect some infrared radiation going through vacuum/air? When we feel the heat from a glowing red heater for example, do we feel the infrared radiation emitted directly by the hot metal, or do we feel the direct contact with the hot air that was heated by this nearby element and traveled to us across the room?
- Infrared cameras see "heat" at a distance obviously, is that different from how our skin detects heat/IR?
- When our skin feels infrared, is it only sensitive to a certain part of the infrared spectrum? Does the infrared range our skin feels correspond to a small range of IR frequencies which correspond to a range of temperatures, that happen to be a "safe" range for our bodies to come in contact with? For example, when something feels "very cold" is that just a signal for our brain that any colder is dangerous, and what feels "very hot" tells our brain that any hotter is also dangerous? But fundamentally it's just a small sliver of the possible temperatures in the universe and there's nothing really fundamentally special about them?
submitted by /u/Belzebutt [link] [comments] |
| Do N95 filters have a breakthrough level? or do they just saturate and clog? Posted: 22 Jan 2022 10:43 AM PST I know vapor filters can breakthrough when the absorbent is saturated, but it seems like most particulate filters just seem to clog and reduce flow rather than breakthrough. Just wondering if N95's can also saturate and breakthrough when used repeatedly without any type of cleaning/washing. And how much it would take to do so? submitted by /u/elsjpq [link] [comments] |
| Does Hydroxyapatite toothpaste offer any sort of protection or remineralization similar to fluoride, or is it essentially useless when compared to fluoride? Posted: 22 Jan 2022 10:58 AM PST I understand that fluoride is what is recommended for a reason, that it forms a barrier to acids that is stronger than the hydroxyapatite in your teeth- but I'm wondering if there is any benefit comparable to fluoride to use this type of toothpaste that would make it worth using? I find it difficult to find un biased information that isn't either anti-fluoride conspiracy theories or just stating why fluoride is recommended without any info on the new toothpastes that are becoming available. TIA! submitted by /u/honeybmama [link] [comments] |
| How does Coriolis effect change the trajectory of an airplane? Posted: 22 Jan 2022 02:23 PM PST According to the Wikipedia page on the Coriolis effect it occurs when we are dealing with two reference frames, a rotating one and an inertial one. If the earth is in the rotating frame and an airplane is experiencing Coriolis effect doesn't that mean the plane is in the inertial reference frame as depicted in thisanimation from the university of northern Vermont? How could that be though? Wouldn't that mean the stars would stop rotating when observed from an airplane and and when flying from the north pole to Mexico you would aim for Africa and let Mexico rotate in to it? Alternatively if the plane is not in an inertial reference frame and it's just rotating with the earth, what would any pilot be correcting for? submitted by /u/john_shillsburg [link] [comments] |
| Are you more likely to spread covid while you have symptoms (since it takes a few days for symptoms to show up)? Or do the chances of spreading it stay the same as when you would have contracted it (and did not have symptoms)? Posted: 22 Jan 2022 09:26 AM PST |
| Was smallpox pruritic at any stage where lesions appeared? Posted: 22 Jan 2022 01:46 AM PST |
| How do pathogen reach to their target site after entering our body? Does the method differ from pathogen to pathogen and if no does medicines also work on same principle? Posted: 22 Jan 2022 11:57 AM PST |
| Why is heroine injected more commonly than other drugs? Posted: 22 Jan 2022 07:50 AM PST There are a different ways to take recreational drugs, but none are taken more intravenously than heroine. Why is this? Has it something to do with the chemistry of the drug that means that direct injection into the blood stream is necessary? I understand you can also inhale heroin, much like you can smoke cocaine, or eat THC. But why is heroine injected more frequently than other recreational drugs? submitted by /u/Kilalemon [link] [comments] |
| Could one theoretically create a neon grow light? Posted: 22 Jan 2022 07:46 AM PST |
| Does topologically associating domain (TAD)percentage similarity between species have anything to say regarding DNA similarities between species? Posted: 22 Jan 2022 12:13 AM PST I saw on a (not very credible) website a post that quoted Trend in Genetics in saying that the similarity in TAD was 43 percent between a chimpanzee and a human and that would mean that they don't share enough DNA to come from the same ancestor. I know they share over 99 percent of their DNA. I was just thinking that do TAD similarity equite DNA similarity? submitted by /u/monkeyat711 [link] [comments] |
| Does Ingesting cannabis (tea & edibles) have immunosupressive effects ? Posted: 21 Jan 2022 09:26 PM PST Smoking anything in general reduces/affect macrophages,reduce immunity and increases the chance of respiratory infections. cannabinoids are immunomodulators in some capacity and have a homogenous relationship with immune cells. If they are ingested instead of smoking do they still have the same effect & reduce/impair your immunity. Making a person vulnerable to infections or exacerbating existing ones? submitted by /u/Metalheadpundit [link] [comments] |
| Can parasites provide some benefits to the host? Posted: 21 Jan 2022 03:27 PM PST I'm working on a sci-fi novel, and while it's fantastical in nature, I still want to make sure I at least get the terminology as correct as possible. There's a creature in the setting that essentially grows inside of a human body if that person is infected. This creature will kill its host for the majority of cases, but some humans can survive. The survivors are malnourished, heavily prone to addiction, and in all likelihood will die a horrible death due to addiction or other direct/indirect reasons. Of those survivors a small percentage may get benefits where they may get some sort of extraordinary ability (think of the comic book/movie Venom), but they're still constantly fighting being eaten from the inside out, needing to take medications and do other things to keep the creature inside in check. So my question is, is a creature like that still considered a parasite? Or can parasite provide no benefit to its host at all? Is it a symbiont instead? A virus? submitted by /u/tee-one [link] [comments] |
