Regarding COVID-19 testing, if the virus is transmissible by breathing or coughing, why can’t the tests be performed by coughing into a bag or something instead of the “brain-tickling” swab? |
- Regarding COVID-19 testing, if the virus is transmissible by breathing or coughing, why can’t the tests be performed by coughing into a bag or something instead of the “brain-tickling” swab?
- What are the possible consequences to a baby's immune system who was born into quarantine?
- NASA is sending a mini helicopter to Mars. How are they certain a propeller will generate lift in that atmosphere?
- When scientists say that the brain isn’t fully developed until you reach 25, what does that entail?
- How do ice core researchers keep their samples from subliming?
- Is the air velocity for blower systems in series additive?
- Given a constant rate of fluid discharge through a fixed diameter pipe against a consistent point on a fixed flat surface, is it possible to roughly calculate the rate of erosion at that specific point given that consistent rate of discharge?
- Does the Heisenberg Uncertainty Principle describe a literal or figurative effect?
- How do black holes have stronger gravity than the stars they are born from?
- Variable ND Photographic Filters: with wide angle lenses, they cast a cross pattern. Why does this happen?
- What the difference between beta-coronavirus and covid 19? If reports say beta coronavirus rna is detected, is it means new virus covid-19 is detected?
- What is the energy source for a virus?
- Whenever a vaccine is approved, what's stopping us from manufacturing it in multiple places at the same time?
- Is spring fatigue a real thing?
- How will SARS-Cov-2 adapt next given the D614G mutation? Also what is the main benefit of the G mutation, does it specifically relate to the Spike proteins’ binding ability with the ACE2 site?
- Can whales, dolphins, and other marine mammals smell underwater?
- Has there ever been an instance of a vaccine being released and then stopped being used because it had harmful effects that were later discovered?
- How do we know the temperature of earth back when we didn’t record it l?
- Is it possible for humans to obtain immunity against coronaviruses after a long evolutionary processes?
- Would it be theoretically possible to become infected with SARS-Cov-2 and Influenza at the same time?
- Why is tests per million an acceptable way to gauge how well a country is doing its testing?
| Posted: 02 Jul 2020 05:34 AM PDT |
| What are the possible consequences to a baby's immune system who was born into quarantine? Posted: 02 Jul 2020 04:42 AM PDT Let's say that the baby was born at the hospital, went home the same day and has had contact only with their parents since then. Is it possible (or probable) that this baby will have a compromised immune system compared to babies who go out and see other people if they stay in quarantine for, say, 6 months? One year? [link] [comments]  |
| Posted: 02 Jul 2020 05:43 AM PDT |
| When scientists say that the brain isn’t fully developed until you reach 25, what does that entail? Posted: 02 Jul 2020 04:37 AM PDT To add to the title, how could for example a 20 y/os brain differ from a 25 y/o [link] [comments]  |
| How do ice core researchers keep their samples from subliming? Posted: 02 Jul 2020 12:29 AM PDT |
| Is the air velocity for blower systems in series additive? Posted: 02 Jul 2020 09:06 AM PDT If I have two fans (blowers) in series that both have positive air flow, will the air velocity always be additive? Say the surrounding room has a flow rate of 20,000 CFM. And I have a fan in that room that can provide 1000 CFM. Assuming the output side of the fan is not exposed to the room. Is the velocity of effluent air of that fan going to always be greater than the room's air velocity? [link] [comments]  |
| Posted: 02 Jul 2020 08:43 AM PDT Hey all, I'm not sure how well I phrased my question in the title, so I will attempt to expand on that a little more down here with a practical explanation: So let us imagine we had a sheet of plywood roughly 2.5cm thick width a density of 600 kg/m3, the other dimensions don't matter such that there is sufficient room for the flow of liquid to hit the surface, eg 30cm x 30cm x 2.5cm. Now let's imagine we had a garden hose width a diameter of 1.6cm, this garden hose outputs a flow of water at a consistent rate of 3.25m/s. Finally let us imagine we live in a perfect world, and I could aim this hose at a fixed point on the sheet of plywood for an infinite amount of time - for the purposes of simplicity this is occurring in a vacuum on earth and the water is hitting the point at a 45º angle (The angle it hit's isn't necessarily relevant to my need of such an equation). I'm wondering if there is a calculation which would give an estimate at the amount of time it will take for that flow of water to erode through that fixed point on the plywood board. I have attempted to Google but all I seem to be able to find is a general equation to find erosion along the length of pipe which the liquid is flowing through - and i'm not sure if this equation would be suitable for my purposes, so any help pointing me in the right direction for a suitable equation would be greatly appreciated, thank you all in advance! [link] [comments]  |
| Does the Heisenberg Uncertainty Principle describe a literal or figurative effect? Posted: 02 Jul 2020 08:25 AM PDT At the most basic level, the Heisenberg Uncertainty Principle is usually described as observing something changes it. Is this literal, as in the instrument you use to observe it bumps it and changes its velocity/location etc? Or is this a more woo woo particle physics effect where something resolves or happens by the simple act of observation? If you blindfold a person next to a pool table, give them a pool cue, and have them locate the balls on the table with the cue (with the balls moving or not), they will locate them by hitting them, but in the act of "observing" (hitting them), their location is then changed. Is this a representative example of the Heisenberg Uncertainty Principle? There is a lot of weirdness and woo woo around how people understand what the Heisenberg Uncertainty Principle actually is, so a basic and descriptive science answer would be great. [link] [comments]  |
| How do black holes have stronger gravity than the stars they are born from? Posted: 01 Jul 2020 12:35 PM PDT Black holes can stop light from escaping, but the stars that they are created from obviously give off light, so what happens to make that change? [link] [comments]  |
| Posted: 01 Jul 2020 11:23 PM PDT Hi, so I'm an electrical engineer with an interest in photography and I am wondering why "variable ND filters" cast a cross pattern when they are pushed close to its maximum attenuation setting with a wide angle lens. Here are some sample photos. AFAIK from what I understand variable ND filters are just two linear polarization filters that can be rotated with respect to one another, followed by a quarter wave waveplate to turn it into circular polarization because linearly polarized light might cause issues with camera autofocus systems. I had an initial guess that when light enters obliquely (since it is wide angle), this might cause suboptimal effects like the axial ratio becoming worse. I don't think this is the case because if that were the case we'd see a radius-dependent effect, not a cross pattern. edit: this also happens on a random wall, so it can't be due to Rayleigh scattering causing light to become polarized. Also, I don't have one of these on hand so I can't really do experiments :( Anyways, I'm curious what you guys think about this. I have a decent idea about RF propagation from my education, and I'm very much interested in the hardcore details so please don't hesitate to go all the way. [link] [comments]  |
| Posted: 01 Jul 2020 11:59 PM PDT |
| What is the energy source for a virus? Posted: 01 Jul 2020 02:07 PM PDT They are not alive, yet they mutate. Where do they get energy? [link] [comments]  |
| Posted: 01 Jul 2020 05:48 PM PDT So I've been reading about the Oxford vaccine for the Covid-19 and how it could be the first one to get approved. Once (or if) it is approved and proven effective, can the "recipe" be passed around so it can be manufactured by several capable labs at once? Does it actually work that way already? [link] [comments]  |
| Is spring fatigue a real thing? Posted: 02 Jul 2020 12:31 AM PDT So I've read a about people saying that common springs get worse if left compressed a long time. As an example, springs in weapons magazines if they are left loaded. Surely a spring (or any metal part) can loose its properties or shape if bent too much, or exposed to high heat, but this surely won't be the case in the example unless you forcefully overload a magazine? I mean, I've never seen a BIC pen with a non working spring, and springs are ubiquitous. The same springs have been in service for decades if not hundreds of years in some applications. Is there any metallurgists(?) here that can shed some light on this? [link] [comments]  |
| Posted: 01 Jul 2020 08:13 PM PDT |
| Can whales, dolphins, and other marine mammals smell underwater? Posted: 01 Jul 2020 12:23 PM PDT |
| Posted: 01 Jul 2020 07:50 PM PDT |
| How do we know the temperature of earth back when we didn’t record it l? Posted: 01 Jul 2020 02:40 PM PDT |
| Posted: 01 Jul 2020 09:58 PM PDT Bacterias are known for its adaptability to its environment and build resistance against harmful elements. Just like also the cockroaches which obtain immunity from poison, toxic elements, radioactive environment and pesticides, I'm wondering if humans can possess some immunity trait from our genes for thousands of years of evolution. [link] [comments]  |
| Posted: 01 Jul 2020 09:27 AM PDT |
| Why is tests per million an acceptable way to gauge how well a country is doing its testing? Posted: 01 Jul 2020 08:38 PM PDT I've tried to understand this multiple times but it doesn't make sense to me. Can someone explain how this works? [link] [comments]  |
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