- Wikipedia states, "The human nose is extremely sensitive to geosimin [the compound that we associate with the smell of rain], and is able to detect it at concentrations as low as 400 parts per trillion." How does that compare to other scents?
- Are there any biological differences between Male and Female hair?
- Is true that fever is a method that use our body to battle the viruses?
- What are you actually smelling when you smell stale air?
- Stress delayed menstruation - cause in follicular or luteal phase, or both?
- How come Delta has been able to crowd out other strains of Covid inmost countries?
- How do hybrids manage power when both the ICE and EM are running?
- What kind of success did alchemy have?
- How do we know how hot the sun is?
- Are immune cells more resistant somehow to being infected by viruses or affected by pathogen toxins than 'normal' cells? If so, how?
- Can the coronavirus possibly be transmitted via second hand smoke?
- How many Influenza vaccines are administered yearly worldwide?
- Plate techtonics quesiton: How is it that the ocean floor is recycled over millions of years, but the land about the ocean isn't?
- What is the difference between chiropractic and osteopathic manipulative treatment?
| Posted: 10 Sep 2021 10:26 AM PDT It rained in Northern California last night for the first time in what feels like the entire year, so everyone is talking about loving the smell of rain right now. [link] [comments]  |
| Are there any biological differences between Male and Female hair? Posted: 10 Sep 2021 10:58 AM PDT I was curious if mens hair has a different make-up over womens hair? If you were to view the hair at a DNA level, would you be able to identify the sex of the person it came from? The reason I ask is because in general, women have longer hair styles and men usually shorter. Is this 100% cultural? And only happens because we are used to these hair styles as the "norms"? Or is there some deeper biology going on that makes humans lean towards certain hairstyles without their knowledge? [link] [comments]  |
| Is true that fever is a method that use our body to battle the viruses? Posted: 10 Sep 2021 10:39 PM PDT Somewhere I read that, that out body produce fever to kill the viruses that enter our body, but at the same time our body gets affected by it ... So is a battle between the virus and our body, who resist more heat? There is some true behind it? One time I feel the first flu symptoms. Put like 3 jackets, when to run under the sun feeling sick. After 40 mins, a lot of cold sweat, but I feel so much better... It was coincidence or it has some kind of science behind it? Thanks in advance [link] [comments]  |
| What are you actually smelling when you smell stale air? Posted: 10 Sep 2021 05:03 PM PDT |
| Stress delayed menstruation - cause in follicular or luteal phase, or both? Posted: 11 Sep 2021 03:47 AM PDT Medical student here, an inquiry from a friend prompted me to do some research since I don't think it was well covered in a textbook. What I know is that stress can delay menstruation via suppressing hormones required for ovulation. And I've always been taught that the luteal phase has constant lenght for each individual (most often 14 days). That would mean that the follicular phase is variable, and therefore under influence of stress and other things, and is responsible for cycle length variations, while luteal is not. But now comes her inquiry: she is in her mid twenties, and as of now 5-7 days late on her period - she has regular cycles, 28 days most months, with some 29 or 30 - absolutely never more. Assuming 14-16 days for her follicular phase ovulation should fall on Aug 21st-23th while menstruation was expected Sep 4th-6th. The thing is, she reported being under heavier stress last week or so, while non in the mid of August since she was on a beach vacation. On top of that, she says college causes her a lot of stress during the year, but the cycle still stays very constant. Reading online some sources say change of scenery can also be the culprit of period variations (works with vacation), while on the med side, could increased cortisol levels cause increased progesterone levels, which could potentially delay uterine shedding and bleeding (luteal phase)? In this post I'm not just looking for the answer/explanation for said case, but more of an expanded review on what are the factors that could cause cycle variations, both in the follicular and the luteal phase, with mechanisms/explanations? And please, more about the factors that could be applicable in cases like this, and less about the better known pathologies which are well covered in the textbooks, and with a low probability to manifest just now. (Not too long of course, you can point me to the right sources so I can research myself.) Thank you very much for the help. [link] [comments]  |
| How come Delta has been able to crowd out other strains of Covid inmost countries? Posted: 10 Sep 2021 08:51 PM PDT Alpha used to be dominant in UK and now it's almost nonexistent there. Is that just due to delta's sheer transmissibility. I would think, since alpha is also quite transmissible it would still somewhat keep a foothold in most countries. [link] [comments]  |
| How do hybrids manage power when both the ICE and EM are running? Posted: 11 Sep 2021 05:57 AM PDT in some cars like the Koenigsegg regera the ICE and EM are mechanically linked together on the same driveshaft, wouldn't this cause issues as the EM tries to speed up much quicker than the ICE can? [link] [comments]  |
| What kind of success did alchemy have? Posted: 10 Sep 2021 02:46 PM PDT You always hear about the outlandish failures of alchemy: it failed to turn lead into gold, failed to make people immortal, failed to create the fabled fifth element (æther). But what success did alchemy have? Since so may people believed and practiced it for so many hundred years I'd assume it made some progress or had some experimental successes it could show off. Am I right? If so, what kind of successes did they have? [Added a "chemistry"-flare since it forced me to add one, when this question is more for the historians of science.] [link] [comments]  |
| How do we know how hot the sun is? Posted: 11 Sep 2021 03:06 AM PDT |
| Posted: 11 Sep 2021 02:40 AM PDT As the title says. I've always wondered about this one, but Google didn't really turn anything up for me. Are immune cells better fortified than those they defend? If not so, wouldn't there be more pathogens targeting it directly? [link] [comments]  |
| Can the coronavirus possibly be transmitted via second hand smoke? Posted: 11 Sep 2021 12:53 AM PDT |
| How many Influenza vaccines are administered yearly worldwide? Posted: 10 Sep 2021 01:40 PM PDT How many influenza vaccines were administered worldwide yearly before covid? So 2018 or 2019. I understand that influenza kills on the order of 500,000 people per year worldwide, while covid kills on the order of 5,000,000 people per year worldwide. But influenza vaccines are traditionally administered yearly to at-risk groups, while covid vaccines have only recently begun to be administered, so it's not a fair comparison. I can find yearly USA Influenza vaccine data, but not worldwide. [link] [comments]  |
| Posted: 10 Sep 2021 09:07 AM PDT Since the seafloor is recycled back into the earth via plate movement, how is it that the continents are also not recycled in the same way? The ocean floor is around 125 million years old, but the continents go back billions of years. How? These are the articles I read which led me to this question. https://earthsky.org/earth/forever-young-earths-crust-recycles-faster-than-we-thought/ https://www.thoughtco.com/how-old-is-the-ocean-floor-3960755 [link] [comments]  |
| What is the difference between chiropractic and osteopathic manipulative treatment? Posted: 10 Sep 2021 01:25 PM PDT I've been reading up on the difference and I can't make heads or tails of it. Chiropractic is pretty well known for its large, somewhat violent movements. Osteopathic manipulative treatment (OMT) taught to DOs, looks and reads very similar to me. OMT's main difference appears to be a more "gentle" approach. Is there data on the efficacy of OMT? Is there data on the efficacy of OMT vs chiropractic? [link] [comments]  |
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