Why are some viral infections permanent, but some are cleared up within a few days? What determines how long it takes the body to clear the infection? |
- Why are some viral infections permanent, but some are cleared up within a few days? What determines how long it takes the body to clear the infection?
- When a gas gets compressed the temperature increases. According to Google the temperature of a black hole is near absolute zero. If a gas gets compresed enough that it becomes a black hole, in wich step does it loose that temperature?
- Does “wind chill” have any effect on ice formation or retention? In other words, if the actual temperature is 33F, but the wind chill is 18, will ice last longer than a temp of 33 with a “real feel” of 36?
- When did physicists realize that nothing can move faster than light and that the speed of light is immutable regardless of the inertial frame?
- Does a concentration gradient only refer to a single unique substance?
- How does alcohol work as a muscle relaxant? Are there any other substances that have the same effect?
- The solar system is one of many in the Milky Way, which is one of 54 galaxies in our local group. That local group is part of an even bigger structure. Is there a limit to how large these structures can be, or will we keep discovering larger and larger ones?
- How are antimicrobial agents tested? For example, if scientists wanted to test the antimicrobial properties of Lysol, how would it be tested?
- When sick, what causes fever?
- How long does the collapsing phase of a supernova last?
- Is it probable that the solar panels from the Mars rover get cleaned by a storm or anything else?
- Has the Earth expanded over the last 3 billion years and is it still?
- I know about the Rutherford-Geiger–Marsden experiment, shooting particles through gold foil, etc., but how did they know how many particles they fired?
- Do all species of mammals produce identical twins?
- Given that mass x gravity = weight, if I were in a 0 gravity environment and I lifted an otherwise heavy car, would I need an extraordinary strength or not?
- How much DNA do scandinavians share with the germanic tribes who migrated there, compared to the earliest populations?
- How did Blackett and Runcorn determine that Earth's magnetic poles had drifted or flipped?
- Why does liquid metal that solidifed quickly has a high strength?
- Could we use the color of a planets aurora to determine the sustainably of human life?
- Is it possible to express a musical sound's timbre quantitatively?
| Posted: 14 Feb 2019 06:30 PM PST |
| Posted: 15 Feb 2019 03:01 AM PST |
| Posted: 15 Feb 2019 04:54 AM PST In other words, is wind chill just something to help make weather reports more sensational, or is there any actual physical effect? [link] [comments]  |
| Posted: 15 Feb 2019 05:25 AM PST After watching this video on Sixty Symbols, I understand that mathematically by applying the Lorentz Transformation to calculate the speed of the photons coming out of a torch from a passenger on a passing train for an observer's frame of reference outside the train, one obtains c as the result for both observers. However it's not clear to me if this is a consequence of Einstein's special relativity, or if the immutability of the speed of light had been previously established. I wildly guess then, without knowing much about the Maxwell Equations that it was those which established the speed of light as constant and the maximum achievable in the universe, but I wonder how and would be thankful if someone could point me to where I can find more information about this. Thank you! [link] [comments]  |
| Does a concentration gradient only refer to a single unique substance? Posted: 15 Feb 2019 08:05 AM PST Let's say I have a membrane with 1 mol/L Mg2+ on one side and the same concentration of Ca2+ on the other; Does this count as a single concentration gradient 1:1 or as two 1:0 and 0:1 ? If the second possibility is correct my follow up question would be: What is the property that governs what each substance is? Is it charge? Size of the nucleus? How does the universe know this? Thank you! [link] [comments]  |
| Posted: 15 Feb 2019 06:26 AM PST I was wondering how alcohol affects the body and if there was some way to achieve the same relaxing effect on the muscles as alcohol without impairing cognitive function, like coordination or judgement. [link] [comments]  |
| Posted: 14 Feb 2019 09:32 PM PST |
| Posted: 14 Feb 2019 11:15 PM PST I'm talking about household disinfectants, something that would be used in a household setting for perhaps disinfecting the bathroom or kitchen counter, not testing antibiotics against an extremely specific type of microbe. Would the testing be done so that the product being tested is directly applied to a surface, allowed to take effect, then swabbed for microbes and then placed into a Petri dish, then placed into an incubator, and then observe for microbes on the agar? Or would they swab the surface first, grow some colonies of the bacteria/whatever else is on there, then drop a small, sterile disc of filter paper soaked in the antimicrobial solution and then placed back into the incubator and then observe how much of the growths in the Petri dish have been killed off? What is there are large colonies of microbes growing? That's not exactly a real-life representation of a common household surface in need of some disinfecting. Any links to a detailed procedure lab? All feedback is appreciated! (edit: spelling) [link] [comments]  |
| Posted: 15 Feb 2019 07:55 AM PST |
| How long does the collapsing phase of a supernova last? Posted: 14 Feb 2019 09:03 PM PST Supernova's occur when a large dying star collapses on itself and then explodes. Given the cosmic scales involved I'm sure this collapse is not instantaneous, how long is all the matter in a dying star collapsing before it explodes? [link] [comments]  |
| Is it probable that the solar panels from the Mars rover get cleaned by a storm or anything else? Posted: 14 Feb 2019 05:09 PM PST |
| Has the Earth expanded over the last 3 billion years and is it still? Posted: 15 Feb 2019 05:31 AM PST |
| Posted: 14 Feb 2019 04:46 PM PST |
| Do all species of mammals produce identical twins? Posted: 14 Feb 2019 11:01 PM PST |
| Posted: 15 Feb 2019 04:16 AM PST The question came up in the comments of a certain anime and I am confused by some people assuring that you need strength to lift it anyway. As far as I know, you shouldn't need it. [link] [comments]  |
| Posted: 15 Feb 2019 03:20 AM PST |
| How did Blackett and Runcorn determine that Earth's magnetic poles had drifted or flipped? Posted: 15 Feb 2019 01:20 AM PST I'm reading "A Short History of Nearly Everything". In it, Bill Bryson tells how Patrick Blackett and S. K. Runcorn determined by the use of tiny grains of iron in ancient rocks, where the poles had been during the creation of said rocks. I told my father this neat fact and he said: "How do they know the rocks weren't just flipped instead of the poles?". How did they? I know how magnetic tape works and thought it could be similar to the alignment of the particles embedded in the tape that represent the waveforms, but as I am no geologist, could not answer his question. [link] [comments]  |
| Why does liquid metal that solidifed quickly has a high strength? Posted: 15 Feb 2019 01:07 AM PST |
| Could we use the color of a planets aurora to determine the sustainably of human life? Posted: 14 Feb 2019 09:07 PM PST |
| Is it possible to express a musical sound's timbre quantitatively? Posted: 15 Feb 2019 12:51 AM PST I know there are a thousand things that could affect tone, and you would probably be quite limited if you were to express it in a single number but, I think it would be super interesting to be able to experiment with different aspects of an instrument and be able to measure their effect on tone. Even if you couldn't express the whole tone as a single number (which I don't really expect is possible), are there any major aspects of tone that could be expressed as a number? [link] [comments]  |
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