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Sunday, January 23, 2022

Do generations of dogs understand relation to their descendants? Like, would a ‘grandpa’ dog know his relationship to a new puppy ‘grandson’?

Do generations of dogs understand relation to their descendants? Like, would a ‘grandpa’ dog know his relationship to a new puppy ‘grandson’?

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
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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

A new Nature paper says that they identified a SNP mutation in a gene related to smelling. However, the mutation is in an intron. I thought the intron got removed and didn't affect the final protein. How does this mutation affect the final protein?

Nature paper: https://www.nature.com/articles/s41588-021-00986-w#MOESM1

submitted by /u/Mateussf
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Is there a terminal velocity for a buoyant object rising through liquid water?

Posted: 22 Jan 2022 10:06 PM PST

If so, how would one calculate it?

submitted by /u/BaconSoul
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Could one theoretically create a neon grow light?

Posted: 22 Jan 2022 07:46 AM PST

Would it be possible to use a neon light to grow a plant?

submitted by /u/DrOverhard
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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
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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
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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
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vào lúc No comments:

Friday, January 21, 2022

Do Covid Vaccines Prevent "Brain Damage"?

Do Covid Vaccines Prevent "Brain Damage"?

Do Covid Vaccines Prevent "Brain Damage"?

Posted: 21 Jan 2022 08:05 AM PST

Way before all these delta plus and omicron variants existed and when covid wasn't as spread, I read that covid causes long term brain damage on people who were healed.

Cured patients were having "confusion, trouble focusing, changes in behaviour, brain fog" and things like that.

https://www.health.harvard.edu/blog/the-hidden-long-term-cognitive-effects-of-covid-2020100821133

https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/how-does-coronavirus-affect-the-brain

I want to ask if these new vaccines also protect against this since they successfully reduce severe symptoms and even death?

By the way, this might not be a thing anymore or that vaccines were not designed to combat this. I don't know. I'm just asking.

These all seemed disastrous when I first read about it and I'm still anxious today.

submitted by /u/sublime_subtlety
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If PCR tests look for specific DNA sequences, how can they be false positives?

Posted: 21 Jan 2022 12:40 PM PST

As per the journal entry I link below, sometimes 5% of PCR tests can be false positives

The UK's COVID-19 testing programme uses real-time reverse transcription polymerase chain reaction (RT-PCR) tests to detect viral RNA.1 Public Health England reports that RT-PCR assays show a specificity of over 95%, meaning that up to 5% of cases are false positives

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7850182/

How can a PCR test be a false positive? You either have the DNA of a specific virus or pathogen you're looking for, or you don't. How can a PCR accidentally find DNA that isn't supposed to be there, and consider it "false" ?

submitted by /u/jack3dp
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How can water act as a moderator in LWRs if it also absorbs neutrons?

Posted: 21 Jan 2022 09:55 AM PST

In an RBMK reactor the moderator is graphite and water is boiled to generate steam, but also used as a coolant. In LWR reactors water is used as a moderator and coolant if I understood it correctly.

So my question is:

Is the water defined as a coolant because it absorbs neutrons from fission, or simply because of its thermal properties? And if it can absorb neutrons, thereby slowing the chain-reaction of fission how can it also be a moderator in LWRs?

submitted by /u/hejhoo
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What are AC and DC currents, and are there other types of electrical currents?

Posted: 21 Jan 2022 09:40 AM PST

Is the full dose of the covid vaccine necessary?

Posted: 21 Jan 2022 08:56 AM PST

Suppose you only got injected with a few drops. Would that have the same effect as the full dose or would it just not do anything. If it does have the same effect why make the dose that large?

submitted by /u/yubjubsub
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Is there any small possiblility that humans get rabbies from rabbies vaccine ?

Posted: 21 Jan 2022 05:55 AM PST

  • can anyhow the vaccine fail and itself cause rabbies?
submitted by /u/ConcentrateSea2778
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AskScience AMA Series: I'm the Director of the Addiction Institute at Mount Sinai who studies the neurobiological effects of cannabis and opioids. AMA!

AskScience AMA Series: I'm the Director of the Addiction Institute at Mount Sinai who studies the neurobiological effects of cannabis and opioids. AMA!

AskScience AMA Series: I'm the Director of the Addiction Institute at Mount Sinai who studies the neurobiological effects of cannabis and opioids. AMA!

Posted: 21 Jan 2022 04:01 AM PST

Hi Reddit! I'm Dr. Yasmin Hurd, the Director of the Addiction Institute within the Mount Sinai Behavioral Health System, and the Ward Coleman Chair of Translational Neuroscience and Professor of Psychiatry and Neuroscience at the Icahn School of Medicine at Mount Sinai in New York. I'm an internationally renowned neuroscientist whose translational research examines the neurobiology of drug abuse and related psychiatric disorders. My research exploring the neurobiological effects of cannabis and heroin has significantly shaped the field. Using multidisciplinary research approaches, my research has provided unique insights into the impact of developmental cannabis exposure and epigenetic mechanisms underlying the drug's protracted effects into adulthood and even across generations. My basic science research is complemented by clinical laboratory investigations evaluating the therapeutic potential of novel science-based strategies for the treatment of opioid addiction and related psychiatric disorders. Based on these high-impact accomplishments and my advocacy of drug addiction education and health, I was inducted into the National Academy of Medicine, complementing other honors I have received in the field. Recently, I was featured in the NOVA PBS film "The Cannabis Question," which premiered in September and explores the little-known risks and benefits of cannabis use. I'll be on at 3 p.m. (ET, 20 UT), ask me anything!

submitted by /u/AskScienceModerator
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How does one create a mass labelled standard?

Posted: 20 Jan 2022 09:37 PM PST

I work with mass labelled standards a lot, particularly C13 labelled compounds. How are these synthesized with such accuracy they can be used as standards? How do we seperate them from their more abundant counter parts?

submitted by /u/burntpeaches
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Why does blue light mess up your sleep?

Posted: 19 Jan 2022 09:50 PM PST

And does it have anything to do with being similar to the sky during the day?

submitted by /u/quagley
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Thursday, January 20, 2022

AskScience Panel of Scientists XXVI

AskScience Panel of Scientists XXVI

AskScience Panel of Scientists XXVI

Posted: 20 Jan 2022 09:56 PM PST

Please read this entire post carefully and format your application appropriately.

This post is for new panelist recruitment! The previous one is here.

The panel is an informal group of Redditors who are either professional scientists or those in training to become so. All panelists have at least a graduate-level familiarity within their declared field of expertise and answer questions from related areas of study. A panelist's expertise is summarized in a color-coded AskScience flair.

Membership in the panel comes with access to a panelist subreddit. It is a place for panelists to interact with each other, voice concerns to the moderators, and where the moderators make announcements to the whole panel. It's a good place to network with people who share your interests!

-------------------

You are eligible to join the panel if you:

  • Are studying for at least an MSc. or equivalent degree in the sciences, AND,
  • Are able to communicate your knowledge of your field at a level accessible to various audiences.

-------------------

Instructions for formatting your panelist application:

  • Choose exactly one general field from the side-bar (Physics, Engineering, Social Sciences, etc.).
  • State your specific field in one word or phrase (Neuropathology, Quantum Chemistry, etc.)
  • Succinctly describe your particular area of research in a few words (carbon nanotube dielectric properties, myelin sheath degradation in Parkinsons patients, etc.)
  • Give us a brief synopsis of your education: are you a research scientist for three decades, or a first-year Ph.D. student?
  • Provide links to comments you've made in AskScience which you feel are indicative of your scholarship. Applications will not be approved without several comments made in /r/AskScience itself.

-------------------

Ideally, these comments should clearly indicate your fluency in the fundamentals of your discipline as well as your expertise. We favor comments that contain citations so we can assess its correctness without specific domain knowledge.

Here's an example application:

Username: /u/foretopsail

General field: Anthropology

Specific field: Maritime Archaeology

Particular areas of research include historical archaeology, archaeometry, and ship construction.

Education: MA in archaeology, researcher for several years.

Comments: 1, 2, 3, 4.

Please do not give us personally identifiable information and please follow the template. We're not going to do real-life background checks - we're just asking for reddit's best behavior. However, several moderators are tasked with monitoring panelist activity, and your credentials will be checked against the academic content of your posts on a continuing basis.

You can submit your application by replying to this post.

submitted by /u/AskScienceModerator
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Why is the speed of sound higher in warmer air?

Posted: 20 Jan 2022 04:41 AM PST

My understanding is that sound travels faster through solids and liquids than through gases because the former states are denser. In other words, molecules would collide with less delay between neighbors when passing along a pressure wave if the density is higher.

But it seems that the speed of sound is higher in hotter air. Hotter air is less dense than cooler air (e.g., hot air balloon).

Can someone please explain what causes the speed of sound to increase in warm air, but also increase when gases are turned to liquids or solids?

submitted by /u/crazunggoy47
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Why root canal hurts soo much if the nerve is dead?

Posted: 20 Jan 2022 08:06 AM PST

How do they make caffeinated drinks not caffeinated?

Posted: 20 Jan 2022 11:40 AM PST

Because tea comes from a plant, how do the remove the caffeine from it? The same for coffee etc.

submitted by /u/Girlc0
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How are Countries named in their non-native languages?

Posted: 20 Jan 2022 11:48 AM PST

Even in multi-lingual countries, how did they decide what the place should be called in the different languages? Where does the English name for Germany or Austria come from when their German-language names are vastly different in pronunciation and literal interpretation? Who took "Nippon" and said, "yeah, that's 'Japan', now."??

submitted by /u/Finebread
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What do common antibody tests reveal? Can they tell between a person previously infected, or vaccinated, or both infected and vaccinated?

Posted: 20 Jan 2022 08:06 AM PST

I have been reading about the different antibody responses to natural infection vs. antibody responses to the different types of vaccination (mRNA, viral vector etc), as well as how in cases of both infection and vaccination, the response can be different if you were infected first, or vaccinated first.

I'm wondering what, exactly, a commonly available, relatively cheap (ideally a two figure sum) antibody test would reveal. Will the result just be positive or negative? Or is it given in terms of the types of antibodies and their relative concentrations?

In other words can such tests differentiate between those with infection- and vaccine-aquired immunity?

submitted by /u/No-Impression-3742
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Would terminal velocity on Mars be the same as on earth and take longer to reach, or be lower on Mars?

Posted: 20 Jan 2022 09:53 AM PST

Cheers fellas.

submitted by /u/CryptographerApart97
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Are there any studies suggesting whether long-COVID is more likely to be a life-long condition or a transient one?

Posted: 19 Jan 2022 03:19 AM PST

Can T-lymphocytes of a person be cloned in vitro?

Posted: 20 Jan 2022 01:21 AM PST

If so, how is it done?

Via bone marrow extraction perhaps?

submitted by /u/OhioBonzaimas
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In the even of an explosive decompression, why would pilots change altitude slowly instead of quickly??

Posted: 19 Jan 2022 12:43 PM PST

Hi,

​

So, wouldn't you want to equalize pressure as soon as possible? That would mean like more oxygen, not having stuff flying around, etc.

However, I read somewhere that experienced pilots do this slowly as possible instead of quickly. Why?

Is it cause of pressure sickness? I thought that occurred in divers cause they absorb nitrogen gas, how does that happen for people in a pressurized cabin? Do other fluids potentially expand?

submitted by /u/HealthMotor8651
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Are lateral flow test kits damaged by freezing temperatures?

Posted: 20 Jan 2022 07:32 AM PST

How is it possible to distribute home test kits, such as COVID but not exclusively, by mail during periods of freezing temperatures when the tests are supposed to be stored above 36F/2C? Can freezing influence the results of these kinds of tests?

submitted by /u/FanZag
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How do less dense material rise in a denser medium on Earth when there is gravity acting on matter but there is no input of energy to make the less dense material rise?

Posted: 20 Jan 2022 07:24 PM PST

If my understanding is correct, a less dense material "rising" means it is going against the direction of gravity, and this is physically impossible according to the laws of Physics.

submitted by /u/yCArp
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How does gravity work in terms of which direction the force is applied?

Posted: 20 Jan 2022 05:41 PM PST

Consider this scenario:

  • Two bodies of mass (A and B) with a great distance between them is orbiting each other in a circular orbit.
  • The time for gravitational waves to reach the other body 1 hour.

For body A, does the force pull towards B's position at the point of wave emission or is it somehow being pulled towards B's current position? If the latter is the case, how does A know B's current position?

Bonus question. Does gravitational waves from different sources collapse into one direction or will the body be pulled towards all the sources directions?

submitted by /u/Stewie977
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Are people who catch COVID-19 multiple times more at risk for long COVID?

Posted: 20 Jan 2022 12:16 PM PST

Were there periods of rapid or 'runaway' global warming, due to tipping points and feedback loops, during the Paleocene-Eocene Thermal Maximum occur?

Posted: 20 Jan 2022 02:53 AM PST

Why do Oak Woodlands and Savannahs thrive in the Bay Area and Central Valley but only exist in small pockets in Southern California?

Posted: 20 Jan 2022 03:29 AM PST

Are we tending towards more infective variants of coronavirus?

Posted: 20 Jan 2022 10:44 AM PST

The delta and omicron variants have both been touted as more transmissible, replacing the existing variants as the dominant forms in the population. With the emergence of omicron as the new dominant variant, does delta simply disappear as omicron is able to outcompete it for hosts? And using that logic would the next major variant have to be even more transmissible?

submitted by /u/Oogaboogag
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Why are there only two signals used in GPS? Wouldn’t having more than two be more accurate?

Posted: 20 Jan 2022 11:20 AM PST

I'm just wondering why we only have L1 and L2 in GPS (and L5 that will be implemented soon). Wouldnt having more signals to compare against each other improve accuracy of points taken? Is it because a third signal would be redundant, or that it wouldnt increase accuracy to the point of being cost effective? Thank you

submitted by /u/Jeskai_Storm_Mage
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Does dietary cholesterol raise serum serum cholesterol levels?

Posted: 20 Jan 2022 03:31 AM PST

An undergraduate in a health related field here I've come across some really confusing stuff regarding this topic. I've always been kind of health conscious from a young age and interested in this kind of stuff.

I was under the impression that saturated fat and cholesterol both contribute to raising serum cholesterol levels.

However one of my professors who's now a epidemiologist/professor and was a practising cardiologist stated that dietary cholesterol raising serum cholesterol levels has been debunked and that saturated (and trans) fats contribute to serum cholesterol levels but not dietary cholesterol.

I've been reading on this and am more confused than I was before.

I see stuff like this

Harvard School of Public Health:

Choose foods with healthy fats, limit foods high in saturated fat, and avoid foods with trans fat.

Although it is still important to limit the amount of cholesterol you eat, especially if you have diabetes, for most people dietary cholesterol isn't nearly the villain it's been portrayed to be. Cholesterol in the bloodstream, specifically the bad LDL cholesterol, is what's most important. And the biggest influence on blood cholesterol level is the mix of fats and carbohydrates in your diet—not the amount of cholesterol you eat from food.

But the American heart association and FDA recommend limiting cholesterol consumption etc. and have also come across many studies showing dietary cholesterol does effect heart health as well as websites claiming that a lot of studies are industry funded and not reliable.

I would like some clarity on this thanks any input is appreciated

submitted by /u/trololol_daman
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Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology

Posted: 19 Jan 2022 07:00 AM PST

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!

submitted by /u/AutoModerator
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After the K-T extinction, how did the survivors live while the Earth was recovering?

Posted: 19 Jan 2022 10:30 PM PST

Clearly not ALL plant and animal life died out with the dinosaurs. How did the ones that clung to life in the post-Chixculub dark era do so?

submitted by /u/BaffleBlend
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How is our atmospheric pressure connected to the gravitational pull of Earth?

Posted: 19 Jan 2022 03:21 PM PST

"All other things being equal," if instead of 9.8m/s2 we had half that gravitational pull at sea level, would atmospheric pressure also be half? The reason I'm asking is because I'm trying to conceptualize what flying would be like with our level of technology on a planet will lower gravity.

Would it become easier to fly since you have to overcome less gravity, or would it be harder because you need more lift due to the atmosphere being thinner, or would it be relatively the same, because the lower gravity would result proportionally similarly lowered density?

submitted by /u/-domi-
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How do drinks that contain terpenes solve them in water?

Posted: 19 Jan 2022 06:31 PM PST

So I read that some drinks contain terpenes like citral to make up the flavour. I'm using terpenes to make liquid for the vaporizer and they taste really good so I wondered if I could make some kind of flavoured softdrinks, but I'm not sure how that works as most terpenes are not solluble in water

submitted by /u/That_Unit_3992
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What is the delta V required to reach the Lagrange point between Sol and Earth and what's an effective way to reach it?

Posted: 20 Jan 2022 03:43 AM PST

How does the recent Tonga eruption compare to the famous Mt. Vesuvius eruption?

Posted: 19 Jan 2022 02:40 PM PST

Just as the title asks. Since most of the public has an idea of the Mt. Vesuvius eruption how much does the recent eruption compare. We have a TON of scientific and recorded data with the recent eruption so how accurately can we compare it to Vesuvius?

submitted by /u/PghMe101
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