- AskScience AMA Series: We're volcanologists with the Smithsonian Global Volcanism Program. 40 years ago today, Mount St. Helens erupted in a very big way. We are here to talk about St. Helens and volcanic eruptions. Ask us anything!
- How do pilots know during a flight when there is turbulence coming? They turn on the fasten seat belt sign, and then it gets bumpy. The turbulence ends, and then they turn off the fasten seat belt sign.
- When the swine flu outbreak happened in 2009, the vaccine took less than a year to be synthesized and released to the public. How come people are worried that the COVID vaccine may be released to the public in less than a year?
- If person 1 is trapped under water, and person 2 has access to fresh air as well as to person 1, for how long can person 2 breath in fresh air and exhale it into person 1's mouth? Is there enough breathable air in an exhalation for this to last indefinitely, or would CO2 toxicity slowly build up?
- Do vaccines have "recipes", and if so, once one lab creates one, is it simply shared with the rest of the world? (And how is it ensured that it's being done right?)
- Is it possible to get infected from a single SARS-CoV-2 particle?
- How much life went into a barrel of oil?
- Have we confirmed that an asymptomatic carrier of covid19 (someone who never develops any symptoms but tests positive) is able to produce enough of a viral load to be contagious?
- If helium balloons float upwards because it's less dense than air, shouldn't a container under vacuum also be lighter than air? Could you make an airship float using vacuum if you had a material light, yet strong enough to not collapse on itself?
- Corona Virus Testing: If SARS-COV-2 is the Coronavirus and COVID-19 is the disease. Are we Testing for the Virus? or the Disease?
- Is there a possibility that the nCov vaccines wont work on people who have already caught nCov?
- Does limescale deposition in kettles etc build up during boiling or afterwards?
- How does the body decide which fat cells to burn?
- Why don't other planets in the Solar System like Mars or Venus have moving tectonic plates?
- How can radiometric dating be used to determine the age of the Earth, when heavy elements are not fused in the solar system?
- What makes it rain harder? Why do some clouds cause flash floods while others hardly drizzle?
- Could SARS-CoV-2 Infect the Brain?
- Why doesn’t PCR just use helicase and DNA Polymerase instead of using heat and TAQ polymerase to clone DNA Strands?
- Does the perigee change if i apply a radially outward force to a satellite?
- Are photons attracted by gravitational force?
- How exactly does remdesivir work?
| Posted: 18 May 2020 04:00 AM PDT In March 1980, new magma began to intrude beneath Mount St. Helens. Over the next 2 months, the north flank of the mountain began to bulge up to 450 feet (~150 m) outward. At 0832 am, Sunday May 18th, 15-20 seconds after a M5.1 earthquake, the north flank collapsed in the largest recorded landslide, allowing the pressurized magma to explode outward in a lateral blast and pyroclastic density current that levelled ~230 square miles of forest. Over the next ~9 hours, about 0.3 cubic miles of ash and pumice erupted explosively. That ash was distributed locally as highly destructive pyroclastic flows and hundreds of miles away as ash fall. The eruption had profound impacts on the science of volcanology, volcano monitoring, hazard communication, and hazard mitigation. The Smithsonian Global Volcanism Program (volcano.si.edu) is here to answer your questions about Mount St. Helens (volcano.si.edu/projects/sthelens40/) and volcanoes in general. We'll be on at 7 pm ET (23 UT), ask us anything! Username: GlobalVolcanism [link] [comments]  |
| Posted: 17 May 2020 08:40 AM PDT |
| Posted: 17 May 2020 10:50 AM PDT |
| Posted: 17 May 2020 03:32 PM PDT |
| Posted: 18 May 2020 07:13 AM PDT |
| Is it possible to get infected from a single SARS-CoV-2 particle? Posted: 18 May 2020 05:45 AM PDT If no, how many of them is enough? And also how long individual particles remain infectious for if suspended in the air? [link] [comments]  |
| How much life went into a barrel of oil? Posted: 17 May 2020 11:03 PM PDT Everyone knows that the fossil in fossil fuel refers to dead life forms, but what does that actually mean? What actually goes into a single barrel of oil? Are we talking discrete animal bodies, organic soil horizons? And just how much biological matter does it take to get one barrel? [link] [comments]  |
| Posted: 17 May 2020 11:08 PM PDT I've found lots of studies that suggest it is possible but nothing that can confirm. Is there a study out there that does confirm? I've heard it suggested that the size of viral load correlates to severity of symptoms. [link] [comments]  |
| Posted: 17 May 2020 10:58 PM PDT |
| Posted: 18 May 2020 04:29 AM PDT I'm having a tough time finding an answer to this. In news, I hear something along lines of "X amount of people tested +ve for COVID-19" which makes me believe that people are being tested for the disease. But then I hear about how some people tested for COVID-19 are asymptomatic. Which confuses me because aren't the symptoms which tell you whether you have the disease or not? [link] [comments]  |
| Is there a possibility that the nCov vaccines wont work on people who have already caught nCov? Posted: 18 May 2020 06:26 AM PDT I know some vaccines against uncurable diseases like HPV don't work if you've already caught the disease. Is there a chance that this will be the case with nCov? [link] [comments]  |
| Does limescale deposition in kettles etc build up during boiling or afterwards? Posted: 18 May 2020 12:05 AM PDT Process of limescale buildup with evaporation I live in an area with hard water so get a lot of limescale in the kettle (by which I mean a stand-alone electric kettle, I'm in the UK). Having just descaled the kettle recently, I was wondering about the process of the scale deposits forming. Presumably they form when the water evaporates, but is it mostly happening as the water is boiling or afterwards as residual (unused) water evaporates? And more practically: Presumably limescale buildup could be prevented if I were to rinse out and then thoroughly dry the inside of the kettle with a towel after each use. But given that I'm not going to do that (it would be difficult as lid opening quite narrow), is it better or worse to leave excess water (whether unused boiled water or freshly poured) in there between uses? Ie, is it better to have an inch of water (a little of which will evaporate) or just the a little dampness (all of which will evaporate between uses)? [link] [comments]  |
| How does the body decide which fat cells to burn? Posted: 17 May 2020 03:51 PM PDT We all know 'spot fat burning' isn't a thing. So how does the body decide where to burn fat from first? Assuming you have an obese person, making a change to get fit, are there places on the body that lose fat first or does it vary from person to person? [link] [comments]  |
| Why don't other planets in the Solar System like Mars or Venus have moving tectonic plates? Posted: 17 May 2020 05:21 PM PDT And what makes Earth so special for having dynamic tectonic plates? [link] [comments]  |
| Posted: 18 May 2020 02:02 AM PDT I understand that unstable heavier elements degrade to lighter elements over time, and that the ratio of these elements can be used to determine when the atoms in a rock were fused. However, since heavy elements are not fused on Earth, or anywhere in the solar system, it's not clear to me how this can be used to estimate the age of the Earth. In principle, it seems like an arbitrary length of time could elapse between the supernova which created the uranium found in a deposit on Earth and the time when the Earth began to form. Is the assumption that the formation of the solar system began shortly after the fusion of the heavy elements now found on Earth? [link] [comments]  |
| What makes it rain harder? Why do some clouds cause flash floods while others hardly drizzle? Posted: 17 May 2020 10:14 AM PDT |
| Could SARS-CoV-2 Infect the Brain? Posted: 17 May 2020 12:04 PM PDT Hello guys, I am currently looking into how the novel coronavirus might be able to spread and infect the brain. There are a couple of reports out there stating that patients are presenting brain complications like meningitis, encephalitis, etc. Is there anyone working on this or do you guys have any insights? Thanks! [link] [comments]  |
| Posted: 17 May 2020 08:54 AM PDT |
| Does the perigee change if i apply a radially outward force to a satellite? Posted: 17 May 2020 11:00 AM PDT If I apply a radially outward force to a gravitationally bound system, starting from a perfectly circular orbit, the new orbit will then be a elliptical. But will the path of the ellipse ever have a point where its radius to the original center of rotation be lower than the original circle? I've been trying to draw a diagram but I'm not sure if it's valid or not. [link] [comments]  |
| Are photons attracted by gravitational force? Posted: 17 May 2020 08:02 AM PDT Are photons affected by gravity? What I mean is when we look at any star it's actually the emitted light... is earth's gravity pulling that towerds it or the photons are targeted towards earth? Also if it's gravity pulling, isn't the speed of light affected by the pull? [link] [comments]  |
| How exactly does remdesivir work? Posted: 17 May 2020 05:35 PM PDT Has it something to do with interfering with a DNA/RNA string and taking the place of one of the nucleobases? [link] [comments]  |
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