Recent comments in /f/askscience
blp9 t1_j5uv2dz wrote
Reply to comment by LSeww in What determines whether we can create a vaccine for an illness or not? by ShelfordPrefect
That is a much better point than "it was never tested on humans".
Is your position that the Pfizer and Moderna Phase 3 trials were flawed in some way and therefore don't count?
KnoWanUKnow2 t1_j5uutzb wrote
Reply to comment by IsaacQqch in Where do bears go when they hibernate? Cartoons convinced me they all lived in caves, but I'm not so sure. by Forge_craft4000
Only the pregnant female polar bears dens. Technically they don't hibernate, as their body temp does not fall and her heart rate does not drop. But she will stay in the den from around October until around May, not eating and not leaving, while she gives birth to her cubs and feeds them for the first few months.
[deleted] t1_j5uujj6 wrote
Reply to comment by b7it_ in Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology by AutoModerator
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science_lake_ocean t1_j5utopu wrote
Reply to why do we not see the reappearance of extinct lifeforms anymore if evolution can retrace its step to redevelop it? by 0011000l
If selective pressure and genetic diversity support it then evolution proceeds (realizing that actual speciation may also require isolation of a sub-group). However, the underlying premise of a linear process is not how evolution works.
[deleted] t1_j5utm1p wrote
Reply to comment by [deleted] in Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology by AutoModerator
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MadcapHaskap t1_j5utcg9 wrote
Reply to comment by IsaacQqch in Where do bears go when they hibernate? Cartoons convinced me they all lived in caves, but I'm not so sure. by Forge_craft4000
The Arctic is sunny all summer, and dark all winter. The temperature changes a ton, as do hunting conditions.
In Grise Fiord, for instance, the average high in July is 7⁰C, the average high in February is -27⁰C
Rule_32 t1_j5ut7dr wrote
Reply to comment by paul_wi11iams in What are the forces on Earth’s Inner Core that change its speed? by BayRunner
>sun loses mass leaving Earth beyond its grasp
This is incorrect. The Suns expansion does not equate to mass loss. Cosmologically its mass will have not decreased that much (which is what will determine where Earths orbit is) but it'll be fusing helium into carbon which is a hotter more energetic process and so the outer layers of the star will get pushed out and the star expands. Earths orbit won't change much however the Suns radius will expand to near or fully envelop Earth.
MrWrock t1_j5usklc wrote
Reply to comment by IsaacQqch in Where do bears go when they hibernate? Cartoons convinced me they all lived in caves, but I'm not so sure. by Forge_craft4000
Temperature definitely changes but food source changes probably have more of an effect. Black bears on BC's Vancouver Island don't hibernate due to tear round food sources.
In fact, no bears truly hibernate. They wake up, stir around, stretch, and go out for food when the weather is nice. What they do is called torpor
prohotpead t1_j5usiaa wrote
Reply to comment by masterpjj in Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology by AutoModerator
It's called having a healthy diet and exercising regularly. People who eat mainly a Mediterranean diet live longer than people with other less healthy diets. There is already a big difference in people who are unhealthy and uncomfortable in their own body by their 60s and people who regularly practice moderate exercise and eat healthy diets who can live comfortable adventurous lives into their 80s and 90s.
Sometimes the world is cruel and someone does everything the can to be healthy and fit into old age but they are robbed of that experience by tragic events and/or disease. Life's not fair.
[deleted] t1_j5usf5x wrote
Reply to comment by Two_Corinthians in Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology by AutoModerator
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Datickysticky t1_j5us66z wrote
Reply to comment by IsaacQqch in Where do bears go when they hibernate? Cartoons convinced me they all lived in caves, but I'm not so sure. by Forge_craft4000
The temperature very much does change, the Arctic Circle has seasonal temperature fluctuations like most of the globe:
https://poseidonexpeditions.com/about/articles/temperature-in-arctic-circle/
[deleted] t1_j5urrvq wrote
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IsaacQqch t1_j5urdez wrote
Reply to comment by KnoWanUKnow2 in Where do bears go when they hibernate? Cartoons convinced me they all lived in caves, but I'm not so sure. by Forge_craft4000
Wait, polar bear hibernate ???? The température don't change why hibernating ?
FellowConspirator t1_j5urcxn wrote
To make a vaccine, the thing that you are making a vaccine against (typically a virus) needs to have a prominent protein on it's surface. The vaccine can be inactive virus, or parts, it doesn't matter, you just need to provide the foreign protein to the immune system so that it can learn to recognize it so when a virus tries to infect, the body is prepared to stop it.
Viruses mutate over time, and if the protein on the outside tends to change a lot, it can be difficult to make a vaccine against. It turns out that small changes in the protein can really change the shape, and it's the shape that the immune system recognizes. The other thing that can make it tricky is that some viruses tend to carry a bubble of fat around them that hides the protein so the immune system can't see it.
HIV is difficult because it has another trick up it's sleeve: it attacks the immune system itself, meaning that if it gets a foothold, a vaccine would be useless because your immune system can't fight back. AIDS, the disease caused by HIV, happens with the immune system pretty much fails because the virus has disabled it. The person starts getting all sorts of infections and cancers that they wouldn't normally get, and that's what makes it deadly.
COVID-19 was simple, for a few reasons: we're already familiar with this type of virus (we've known about coronaviruses for over 60 years, how they work, the genes in them, etc.) and they have whopping big proteins on the surface that don't change a whole lot with time. We also know have molecular biology technology developed in the past few years that makes it possible to rapidly sequence RNA, synthesize RNA, and deliver RNA to cells to express it. So, it took about 3 days to sequence the virus, and a few weeks, to synthesize the RNA message that could teach cells to produce the surface protein of the virus and teach the immune system to recognize it. The whole process could technically be done in a week -- the parts that slow it down are: scaling up production, setting up quality control to make sure it's consistent without contamination, and all the safety testing and process to review safety data, get permission to proceed, etc.
FelisCantabrigiensis t1_j5uq5rq wrote
Reply to comment by Suspicious_Ad_4768 in What determines whether we can create a vaccine for an illness or not? by ShelfordPrefect
I haven't kept up with the exact differences, but I will say that rabies is 100% deadly and herpes is 0% deadly, which may affect the amount of effort put into this.
Rabies also does not hide out in nerves. It travels along nerves to the brain, but it doesn't hide there in a mostly-inactive state for a long time. It vigorously infects nerves and travels along them, which makes it more vulnerable to immune cells and also triggers more response from immune cells.
[deleted] t1_j5uq4zx wrote
[deleted] t1_j5uphjk wrote
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[deleted] t1_j5upgi9 wrote
Reply to comment by Zolden in Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology by AutoModerator
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[deleted] t1_j5upft5 wrote
Reply to comment by KnoWanUKnow2 in Where do bears go when they hibernate? Cartoons convinced me they all lived in caves, but I'm not so sure. by Forge_craft4000
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HighlandHiker t1_j5up3ja wrote
Reply to comment by sharplydressedman in Can you scan a brain and diagnose a mental disorder? by friday_panda
Quick add-on: Test specificity is how good it is at a positive result being a true positive result (not false positive). Sensitivity is the same for negative results (true negative, not false negative). A test with good specificity and/or sensitivity can be useful as a tool. Worse sensitivity and specificity make it less useful.
SuperBigMiniMe2 t1_j5uomey wrote
Reply to Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology by AutoModerator
Economics:
I can't wrap my mind around the following:
Is an economy where money is created on the fly actually sustainable? (I'm thinking both printing more money as well as creating virtual money (perhaps temporarily), when a bank gives out a loan for example).
Treat me like an economics noob!
Suspicious_Ad_4768 t1_j5uof5a wrote
Reply to comment by FelisCantabrigiensis in What determines whether we can create a vaccine for an illness or not? by ShelfordPrefect
So herpes hides in the nerve cells. So does Rabies, but how do we have a vaccine for Rabies?
Erlian t1_j5uodaz wrote
Reply to comment by Two_Corinthians in Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology by AutoModerator
I find it hard to believe - as far as I know this viewpoint is not mainstream. Maybe cherry picked, but more likely the study isn't a very representative or large enough sample. It could also be that these policies in theory should help the labor side, but in practice there are some confounding variables - ex. "well we would pay you more except for this pesky law preventing us, sorry" being used as an excuse, or general disdain for the idea of raising everyone's wages vs. stagnating most employees' wages save a few favorite employees / new hires.
Could also be that a requirement to post salary ranges gives companies better information on what the lowest wage is that prospective employees would truly accept.
I also find it suspect that the article is lumping together a study that focused on pay transparency and university professors, with a different study on a pay disparity law and saying their results suggest similar conclusions. They are different policies, different samples, and different effects - tricky comparison to make.
Was having trouble finding other studies, but here's a good place to dig around: https://scholar.google.com/scholar?hl=en&as_sdt=0%2C38&q=effects+of+pay+transparency+on+wages&btnG=
b7it_ t1_j5unxmu wrote
Reply to Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology by AutoModerator
What does pressure have to do with boiling
PerpetuallyLurking t1_j5uv6pk wrote
Reply to comment by Suspicious_Ad_4768 in What determines whether we can create a vaccine for an illness or not? by ShelfordPrefect
Yeah, the fact that no one dies OF herpes has a lot to do with the impetus to find a vaccine vs everyone who gets rabies dies. And even then HPV is related to herpes, can lead to cancer, and now has a vaccine. So…wait patiently, probably. They’re working on the deadly ones first, not the annoying ones that do have a reasonably easy treatment.