Why do you lose consciousness in a rapid depressurization of a plane in seconds, if you can hold your breath for longer? |
- Why do you lose consciousness in a rapid depressurization of a plane in seconds, if you can hold your breath for longer?
- Is the growth of algae on turtles' shells harmful to them?
- Earth's magnetic field is caused by our iron core, but if the sun's core is made up of hydrogen and helium, how does it have a magnetic field?
- Joe Biden said the Amazon absorbs more CO2 than the U.S. emits. Is this true?
- If you're in orbit, you can burn forewards in to a higher orbit, but you go slower in a higher orbit (once you've circularised). Where does that speed as potential energy go if you escape the body you're in orbt of?
- Are there any infectious disease that can infect 'simpler' animals like sponges/jellyfish/etc ?
- What is the history of soil? Where did soil come from?
- How is it possible for a medical examiner to find COVID-19 cases for people who passed away weeks / months before community spread was known about?
- How do we know that Corona virus can be asymptomatic in some cases?
- How/Why is brass antimicrobial ?
- Can antibodies mutate like viruses do?
- Why hasn't a combination vaccine been created that gives immunity to both type A and type B influenza?
- How does radiocarbon dating work ?
- How does the sun generate what we interpret to be 'light'? Where do the photons come from?
- Why is it that semiconducting materials have lower resistances the hotter they get?
- For satellites such as the James Webb, what are the benefits of observing infrared light versus visible light?
- How can something have low density but high pressure?
- Is there statistically significant evidence tying COVID-19 to stroke / thrombotic complications?
- If I put my hand out in outer space, will I feel the blistering cold since there are no particles to transmit the (lack of) heat?
- At what population percentage of people testing positive for antibodies indicates "herd immunity" is in effect?
- What's the difference between a turtle and a terrapin?
| Posted: 24 Apr 2020 04:31 AM PDT I've often heard that in a rapid depressurization of an aircraft cabin, you will lose consciousness within a couple of seconds due to the lack of oxygen, and that's why you need to put your oxygen mask on first and immediately before helping others. But if I can hold my breath for a minute, would I still pass out within seconds? [link] [comments]  |
| Is the growth of algae on turtles' shells harmful to them? Posted: 23 Apr 2020 09:37 AM PDT I recently saw a post on another sub about a woman who was scrubbing clean these turtles' shells and that got me thinking if that was actually helpful or if there is a whole ecosystem dependent on that. Cheers! [link] [comments]  |
| Posted: 23 Apr 2020 10:08 PM PDT |
| Joe Biden said the Amazon absorbs more CO2 than the U.S. emits. Is this true? Posted: 23 Apr 2020 11:56 PM PDT |
| Posted: 24 Apr 2020 05:07 AM PDT So, when you add energy, you go in to a higher orbit, but higher orbits are slower, as you're speed determines the height of a stable orbit, and if you're in a higher orbit and burn retrograde, you're orbit shrinks, making you go faster due to the conservation of angular momentum, right? So if you add energy, making you go slower, but increasing you're overall potential energy above the planet because you're in a hgher orbit, where does this potential energy go once i go slow/fast enough to escape orbit? Is it that it is still there, in the limted attraction between the planet and my craft, despite the fact that i'm now orbiting the sun. Also (sorry), if higher orbits are slower, yet i have to be going a certain speed to escape orbit, but when I add energy, I go slower, until I add enough to escape by going fast, how does that work. Sorry, I realise that this isn't the clearest, but thanks anyway! [link] [comments]  |
| Are there any infectious disease that can infect 'simpler' animals like sponges/jellyfish/etc ? Posted: 23 Apr 2020 11:38 PM PDT |
| What is the history of soil? Where did soil come from? Posted: 23 Apr 2020 07:52 PM PDT Hello, science! How's it going? When did soil become a thing? And modern soil probably differs from that earliest soil, right? I mean, there would have been no plants? But moss and lychen and algae? And, at some point, was there soil without worms in it? But aquatic worms would have been around? Or is that all later? Of course, this all begs the question of "what is soil"? Did soil begin in stagnant bodies of water? The more I think about it, the more it cascades. Help, please! [link] [comments]  |
| Posted: 23 Apr 2020 09:04 PM PDT I ask because California's Governor has just asked medical examiners to reevaluate deaths from as far back as December. How long does a medical examiner have access to a body? Shouldn't these people be long buried / cremated by now? [link] [comments]  |
| How do we know that Corona virus can be asymptomatic in some cases? Posted: 23 Apr 2020 10:00 PM PDT |
| How/Why is brass antimicrobial ? Posted: 23 Apr 2020 09:04 PM PDT |
| Can antibodies mutate like viruses do? Posted: 24 Apr 2020 07:07 AM PDT And if so, does that mean some people who have survived a specific set of different pathogens could be immune to a pathogen that uses mechanisms that are countered by this cocktail of antibodies? [link] [comments]  |
| Posted: 24 Apr 2020 05:25 AM PDT |
| How does radiocarbon dating work ? Posted: 23 Apr 2020 08:39 PM PDT I was wondering how scientist can determine how old is something and stumbled upon something called radiocarbon dating but I just can't wrap my head around it. Thanks. [link] [comments]  |
| How does the sun generate what we interpret to be 'light'? Where do the photons come from? Posted: 23 Apr 2020 02:36 PM PDT |
| Why is it that semiconducting materials have lower resistances the hotter they get? Posted: 23 Apr 2020 08:38 AM PDT |
| Posted: 23 Apr 2020 03:50 PM PDT |
| How can something have low density but high pressure? Posted: 23 Apr 2020 05:17 PM PDT Listening to a thing on Saturn and the oft remarked fact that it's less dense than water came up, before saying that the pressure would crush any spacecraft entering the atmosphere. How does this work? Pressure is weight per area, and weight is a factor of mass, which is a factor of density. Isn't it? [link] [comments]  |
| Is there statistically significant evidence tying COVID-19 to stroke / thrombotic complications? Posted: 23 Apr 2020 03:03 PM PDT A few articles have come out this week drawing some attention to increased strokes and similar complications in COVID patients. Most rely on the initial CNN "report" which does not have strong evidence to back these claims. That being said, I did find this: Thrombotic Complications in COVID-19 ICU patients 30120-1/pdf) Which claims that there is a 30% incidence in observed COVID ICU patients experiencing complications due to blood clots. I am somewhat skeptical of this, but am not fully comfortable digesting research papers such as this one. It seems to me that these claims still lack a large n-value, and may be coincidental. Additionally, the authors' funding disclosed at the bottom may play a factor. What do you think? [link] [comments]  |
| Posted: 23 Apr 2020 01:50 PM PDT Side questions : When my hand is in space, if I feel cold, where is cold coming from? My skin de-heating? But how is it de-heating if there's no matter to transit heat to? To properly understand: Back on earth, when I feel the air outside and it's warm, am I feeling the temperature of the air particles around me? Why is being in the shade so much cooler if temperature is transmitted through the air? Thank you very much! [link] [comments]  |
| Posted: 23 Apr 2020 12:09 PM PDT In the past couple days reports have begun to emerge indicating a significant fraction of the general population have covid-19 antibodies. NY today reported 13% of the population have them. At some point, this becomes indicative that an infectious person is no longer spreading because most people they encounter, no longer catch the disease. What do the antibody tests tell us about where we are on that timeline? What percentage antibody positive says "its ok to reopen everything, we're mostly immune" [link] [comments]  |
| What's the difference between a turtle and a terrapin? Posted: 23 Apr 2020 01:29 PM PDT I never understood the actual difference between a turtle and a terrapin. Could someone explain it to me in the complex way and simple way? [link] [comments]  |
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