Have cases for other contagious illnesses, such as the common cold, experienced a notable decrease this year due to mask mandates and social distancing? |
- Have cases for other contagious illnesses, such as the common cold, experienced a notable decrease this year due to mask mandates and social distancing?
- How does a cell ‘know’ what to become, if they all start from one or two cells and have the same genetic code?
- If you had a set of points but instead of having their coordinates you just have arbitrary values of distance between each of them, how many dimensions would you need in order to map them?
- Does the rim on a baking sheet impact heat distribution or circulation in an oven?
- Some COVID-10 vaccine candidates (e.g. Oxford) use Adenovirus as a vector to transport mRNA of Sars-CoV-2's spike protein. What if the recipient of such vaccine had a prior infection of that adenovirus and now has immunity against it, will the vaccine still work? if so, how?
- At what point does a baby's heart start beating, and how?
- With the amount of smoke generated by the massive wildfires in the western United States, would this help slow global temperature increase by effects similar to Nuclear Winter?
- When we have a fever, what physically changes in our bodies to make our internal body temperature go up?
- How can uranium hexaflouride have a boiling point lower than its melting point?
- Max heart rates, why do they differ so greatly from person to person and how does it effect performance in a cardio based sport ( get scientific) ?
- Why is it so difficult to create a medication that fits its intended molecular target perfectly and only works on its intended target?
- Does naturally magnetisted magnetite(lodestones) occur on other planets?
- Is the Palmaris Longus, vestigial or functional?
- How are winds "made"?
- How does a new recessive gene get spread?
- Fourier analysis for exoplanet detection?
- Does engaging multiple senses help ingest more information, and to what extent?
- Struggling to understand the results of this soil nutrient test. Initial reading of phosphorus content was extremely low, but I let the test sit longer than prescribed and now it's much higher? (Much more info included)
- Is it possible that the original SARS-Cov from 2003, was spread more that it is known, but wasn't detected because the asymptomatic cases weren't tested?
- How much iron does a star create before it explodes?
- Can blood oxygen levels be used to estimate time of death?
- How do the redundancy systems in aeroplanes work?
| Posted: 12 Sep 2020 11:13 AM PDT |
| Posted: 13 Sep 2020 05:47 AM PDT I mean, if a human starts from two cells (sperm & egg) and all subsequent cells have the same DNA, then how does each cell know where it should go, i.e. arm, liver, bone, etc. What's to stop them all trying to become the same thing? [link] [comments]  |
| Posted: 13 Sep 2020 01:27 AM PDT |
| Does the rim on a baking sheet impact heat distribution or circulation in an oven? Posted: 12 Sep 2020 06:32 PM PDT A handful of baking articles claim a baking sheet with no rim is superior because the rim on a baking sheet reduces the circulation of heat, resulting in uneven cooking. What is the science behind heat "circulation" in an oven? I understand most home ovens have elements that heat up, and heat the air around them. Do they have fans to evenly distribute the heated air? [link] [comments]  |
| Posted: 12 Sep 2020 12:45 PM PDT |
| At what point does a baby's heart start beating, and how? Posted: 12 Sep 2020 11:15 AM PDT |
| Posted: 12 Sep 2020 09:25 PM PDT With the amount of smoke being generated, isn't this a similar scenario to where a nuclear scale war causes a "Nuclear Winter"? If this is the case, wouldn't this theoretically help slow and/or decrease the rate of global temperature increase? [link] [comments]  |
| Posted: 12 Sep 2020 08:45 AM PDT |
| How can uranium hexaflouride have a boiling point lower than its melting point? Posted: 12 Sep 2020 09:27 AM PDT Google says the melting point is 147.3°F but the boiling point 133.7°F. How is this possible? [link] [comments]  |
| Posted: 12 Sep 2020 09:36 AM PDT Please note Regardless of age, I know the older you get the lower your max heart rate gets, what i'm asking is not age related. Example agred 40 male has a max HR of 200, where as a person of the same fitness level has a Max heart rate of 180 [link] [comments]  |
| Posted: 12 Sep 2020 07:06 PM PDT |
| Does naturally magnetisted magnetite(lodestones) occur on other planets? Posted: 12 Sep 2020 10:16 AM PDT Humans learnt the properties of magnetism slowly because they found very rare lodestones on earth. I know magnetite occurs on other planets, but do magnetised lodestones exist on the surface of other planets as well? [link] [comments]  |
| Is the Palmaris Longus, vestigial or functional? Posted: 12 Sep 2020 03:30 PM PDT The palmaris longus (PL) is often cited as a vestigial and functionally useless muscle, although useful as a graft. Now, while it may not functionally affect the majority of the population in terms of grip strength, it appears that in high level sports requiring strong grip, top athletes are more likely to have a palmaris longus than lower performing athletes. Another interesting aspect is that the PL may affect the tendency for people to use one hand for writing over the other if the preferred writing hand has a PL. Using myself as an example, I have a PL on my left wrist and no PL on my right wrist, and it is preferred for writing. Interestingly enough, I prefer to throw with my right, use a knife with my right, strum guitar with my right. In fact about the only things i use my left hand for that is different to a right handed person is writing and using a spoon. I also notice that when pinching my thumb and pinkie finger together on my left hand, that it is far stronger and can exert pressure and can be positioned directly on my thumb. Whereas my right thumb-pinkie pinch can barely exert any force and cant actually bend far enough to properly meet the thumb, although it certainly can be manually bent further (so flexibility is not the issue) Given these factors, is it actually correct to call the PL vestigial, when in reality it seems to increase pinch pressure, range of motion, force exertion and dexterity for the pinkie finger? [link] [comments]  |
| Posted: 12 Sep 2020 12:58 PM PDT By using a fan we can create a wind. But in nature, how does wind appear? [link] [comments]  |
| How does a new recessive gene get spread? Posted: 12 Sep 2020 09:54 AM PDT When a new recessive allele comes into existance by a mutation obviously only that one individual has it and some of his descentants will have one copy of the allele. But how then does it ever happen that another individual inherits the recessive allele from both parents? I can only think of two options: either the same mutation happens twice (extremly unlikely) or inbreeding of two individuals who got the recessive allele from the same ancestor? Does that mean without inbreeding there would be no recessive allele ever getting activated? Or am I thinking about this in completly the wrong way and it is the other way around: A new dominant allele comes into existance and it overrides an existing allele that is now considered recessive. [link] [comments]  |
| Fourier analysis for exoplanet detection? Posted: 12 Sep 2020 07:30 PM PDT Dear astronomers, For context, I am a mecanical engineering student and I am curently taking a class about partial diferential equations and one of the main tools we use for the resolution of some of those equation is the fourier analysis. Other piece of context, a couple of years ago, I took an introductory class about astronomy and we talked about exoplanet detection by mesuring the dopler shift of the light emitted by the star caused by the movement of the star due to exoplanets orbiting the star. (so the star would "usualy" be centered at a point "C" when no exoplanet would be pulling on it and the gravitationnal pull of an exoplanet would make it, the star, orbit the point "C", causing a dopler shift) So I have always had this interrogation about how astronomers are able able to detect more than one planet around a star. In fact, to me it used to make no sense that they would be able to detect what movement of the star would be caused by planet A and what movement would be caused by planet B. So, upon learning about fourier analysis and how you can "easily" extract information about what frequency compose a signal (this technique is used a lot in sound editing), I was wondering if a kind of fourier transform was used to analyse the movement of a star and pull out the component frequency in order to differentiate the different exoplanets influencing a star. ( In fact, you can assimilate the front to back movement of a star to a kind of signal a little bit like in sound editing. It is my understanding that you can mesure this movement using the dopler shift of the star. I would also guess you could use complex numbers to describe the 2D motion of the star, but I have no idea if it is actually mesurable using the dopler shift. ) Finally, I know some other methods are also used for detection, such as the transit method, and, while I dont believe fourier analysis would be a useful tool for differentiating between one large planet and many small ones with this method, I would also like to know how astronomers manage that. I hope my explanations are clear and I hope someone will understand what I mean. If you are an astronomer, I would love to know how you actually detect exoplanets, as I am sure my understanding is either really dumbed down of totally wrong. I also apologize for any typo, english is not my mother tongue. TLDR: I dont get how astronomers manage to differentiate between one big exoplanet and many small one and I am wondering if the answer lies in a nice piece of math I recently learned. [link] [comments]  |
| Does engaging multiple senses help ingest more information, and to what extent? Posted: 12 Sep 2020 08:03 AM PDT When I'm watching a music video, am I actually taking in visual and auditory information simultaneously, or just rapidly switching? Does it matter functionally? Can using multiple senses meaningfully increase one's "input bandwidth"? Does engaging multiple senses help accelerate learning? [link] [comments]  |
| Posted: 12 Sep 2020 08:31 AM PDT So for starters I'm using a HoldAll Soil Test Kit. There's four tests - pH, nitrogen, phosphorus, and potash. I'm struggling to understand the phosphorus test. The directions have me add a prepared soil+water solution and a capsule of white powder to a small test tube, shake vigorously, and allow to develop for 10 minutes after which I'm supposed to compare to a color chart. I followed the directions and my initial reading was that my phosphorus content was very low. Unfortunately I don't have a picture of this initial reading, but here's where I start to get confused... This test develops on a blue color intensity scale. The darker the blue, the higher the phosphorus. The first test read at 'very low' but I noticed at the bottom of the test tubes there were several dark blue chunks of sediment. I tried shaking the test to get them to dissolve to no avail. Then I got distracted and walked away. About 24 hours later I came back and the dark blue chunks appeared to have dissolved and the test now reads at 'medium'. Here's a picture of the current state of the test. So my question is which is the accurate answer? The test was only supposed to develop for 10 minutes, yet the presence of dark blue chunks at the bottom make me wonder if there was an issue with the reagent dissolving resulting in an initial incorrect reading. Or perhaps is this by design and the second reading is the inaccurate one?? Help me science Reddit! [link] [comments]  |
| Posted: 12 Sep 2020 08:08 AM PDT I have read some serology epidemiological studies for SARS seroprevalence, mainly in China, general population and healthcare workers, which showed low percent for seropositive individuals, but can it be because of the short life of the SARS antibodies? Also there was one study which tested animal traders in China, and 13% had antibodies to SARS. This may show that the antibodies can last longer if the person is exposed constantly to the antigen. https://pubmed.ncbi.nlm.nih.gov/14561956/ Another study showed that 1.8% of blood samples from 2001 were positive for SARS-related antibodies, which shows that there can be outbreak without it being detected. [link] [comments]  |
| How much iron does a star create before it explodes? Posted: 12 Sep 2020 09:26 AM PDT I have heard that as soon as a star tries to fuse iron atoms it explodes, but there is an abundance of iron in the universe so how does that work exactly ? [link] [comments]  |
| Can blood oxygen levels be used to estimate time of death? Posted: 12 Sep 2020 08:44 AM PDT Blood oxygen levels are usually in the 90s and usually measured by a finger monitor in the clinic. However, once the heart stops pumping, cells will consume oxygen in the finger causing the oxygen levels to decrease. Can this be used as an estimate of time of death? For example, if a finger reading shows 50% oxygen saturation could you conclude that the person had died e.g. 2 hours prior? [link] [comments]  |
| How do the redundancy systems in aeroplanes work? Posted: 12 Sep 2020 02:10 PM PDT If there are several lines of cable to one of the elevators, for example, are they all firing all the time? Or is there some kind of gate that only opens the other redundant lines once the first or main line has failed? [link] [comments]  |
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