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Sunday, January 5, 2020

What are the effects of the smoke generated by the fires in Australia?

What are the effects of the smoke generated by the fires in Australia?


What are the effects of the smoke generated by the fires in Australia?

Posted: 04 Jan 2020 07:39 PM PST

I'd imagine there are many factors- CO2, PAH, soot and carbon, others?

submitted by /u/PseudoWarriorAU
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Does distributed generation (e.g. rooftop solar) on a power grid reduce transmission demand?

Posted: 04 Jan 2020 08:22 AM PST

How do ants breathe?

Posted: 04 Jan 2020 09:26 PM PST

A friend of mine randomly decided to tell me that ants don't and/or can't sleep but then said even more interestingly that they do not have lungs, so my question was, how do they breathe? She said though their movements but how does that work??

submitted by /u/Sinkarma
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If a radio antenna broadcasted a signal at a frequency of 430 Terahertz (a frequency of visible light) would you be able to see light emitting from the antenna itself?

Posted: 04 Jan 2020 11:28 PM PST

Are all planet's cores made out of iron?

Posted: 05 Jan 2020 08:04 AM PST

What makes a soap a "germicidal" soap?

Posted: 05 Jan 2020 01:09 AM PST

I mean, since all soaps are meant to rid surfaces of organic, non-polar molecules, shouldn't they work equally since all bacteria and viruses are made of organic, non-polar molecules?

submitted by /u/andy_man17
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If you turn an electromagnet on, does the magnetic field get created instantly, or does it get created gradually?

Posted: 04 Jan 2020 08:29 PM PST

Follow up question: if it gets created gradually, how fast is it?

submitted by /u/SlitherySnekkySnek
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Why do some substances like soap foam while others do not? What exactly causes it to foam?

Posted: 04 Jan 2020 07:59 AM PST

When we say a species is older than dinosaurs what do we mean by that?

Posted: 04 Jan 2020 05:45 PM PST

I saw a post today about the lamprey fish, and how it's older than dinosaurs.

What does this mean, it's not that this species has remained genetically the same millions of years that one could reproduce with an individual from that long ago, surely it's evolved so much by now that it would be considered a different species even if it looks similar.

So really all species are older than dinosaurs as they all stem from before dinosaurs?

submitted by /u/MrHelpMePlease2
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If the solar sytem is revolving around the Milky way, is our galaxy revolving around something?

Posted: 04 Jan 2020 04:24 PM PST

Can an asteroid (iron or rock) be so old it can't be dated with our current testing methods?

Posted: 04 Jan 2020 05:28 PM PST

If an asteroid had been traveling across the Milkyway galaxy from when it first formed and passed through our solar system and we were able to get samples from it, is it possible that it can be so old we can not date it? Oumuamua comes to mind.

What would the oldest date we could determine with current testing methods?

submitted by /u/FBIsurveillanceVan22
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Why can feathers come in pretty much every color, but fur is always black, gray, white, brown, orange, or yellow?

Posted: 04 Jan 2020 02:37 PM PST

Why are the centres of galaxys always so bright in pictures?

Posted: 04 Jan 2020 10:19 PM PST

How do auto manufactures avoid RF interference with adaptive cruise control systems?

Posted: 04 Jan 2020 06:02 AM PST

Do other radar systems interfere with each other in the allotted band? For example, could Tesla's adaptive cruise system interfere with another car that has a similar system in the same vicinity?

submitted by /u/twrzy
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Why do some people think cilantro tastes like soap?

Posted: 04 Jan 2020 09:13 AM PST

According to articles I've found, up to 14% of the population is repulsed by cilantro, claiming it tastes like soap. This apparently has a genetic component, although the specific genes involved seem to be complicated.

My question is about how these genes affect taste receptors or the brain to make the subjective experience of tasting cilantro differ so much between two different groups.

submitted by /u/viceni
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Do phonons have any meaningful or measurable interaction with photons?

Posted: 04 Jan 2020 12:16 PM PST

How do high voltage power lines simultaneously have high voltage and low current?

Posted: 04 Jan 2020 12:07 PM PST

It is pretty straight forward that decreasing the current flowing through a transmission line also decreases the loss of power from transmitting through that line due to:

P = I^2*R

P: Power Lost

I: Current

R: Resistance

Every source that I have found states that current is decreased in long distance power transmission by using increasing the voltage. Why doesn't this idea conflict with ohms law?

V = I*R

V: Voltage

If the voltage is increased shouldn't the current also increase, not decrease?

Thanks!

submitted by /u/ConfusedScienceGuy
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Why is it that we salivate when thinking about or seeing food we like?

Posted: 04 Jan 2020 04:03 PM PST

Without an alarm or other external source for waking us up, what prevents our brains from being asleep forever?

Posted: 03 Jan 2020 09:21 PM PST

Do humans sneeze in their sleep? What state or consciousness is required for a sneeze to be triggered?

Posted: 04 Jan 2020 02:22 AM PST

Why doesn't the bottom of the ocean freeze? No light reaches it so surely it would be below freezing, right?

Posted: 04 Jan 2020 05:13 AM PST

When animals/insects are in their respective mating seasons and find a mate, do they always produce offspring?

Posted: 04 Jan 2020 10:45 AM PST

Not like always... but is it more often than not or is it still a random process?

submitted by /u/prehistoriclurker
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Saturday, January 4, 2020

If skin from one area of the body is used to repair a wound elsewhere, what happens to the area where the skin was taken from?

If skin from one area of the body is used to repair a wound elsewhere, what happens to the area where the skin was taken from?


If skin from one area of the body is used to repair a wound elsewhere, what happens to the area where the skin was taken from?

Posted: 03 Jan 2020 07:52 PM PST

Sorry for the confusing wording, but I was just reading about a man who had skin cancer removed from his back, and skin from his thigh was used to repair the area on his back. Which made me wonder, then what happens to his thigh? Doesn't that just leave a similar wound in a different place?

submitted by /u/tenthandrose
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What causes shockwaves to form on an airfoil when the airflow is supersonic? Why does this cause flow separation?

Posted: 03 Jan 2020 11:10 PM PST

How does dehydration kill you?

Posted: 03 Jan 2020 03:06 PM PST

Particularly dehydration from not drinking water. I'm not asking about hypovolemia due to hemorrhage, burns, diarrhoea, vomitting or other factors.

I'm aware that dehydration disrupts a plethora of biological processes which leads to a variety of things going wrong in our body. But there must be one (or perhaps a few?) factor(s) that eventually lead to death.
Is it the hypovolemic shock? Is it perhaps dyselectrolytemia?

I have a vague memory in my mind that it's because of hyponatremia, but that doesn't make much sense. We only lose sodium through our sweat and can replenish it from food, which means if we avoid an environment that causes us to sweat and eat enough, that'll prolongue our chances of surviving without watter. Sounds ridiculous.

Hypernatremia makes more sense. If we don't drink water, we lose water content while our sodium stays relatively the same (we lose some through sweat, but sweat is quite low in sodium and we would lose more water than sodium anyways). High blood sodium concentrations would obviously dehydrate our cells osmotically as well as disrupt CNS action potentials.

submitted by /u/MaximStaviiski
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What is the functional reason as to why some leaves are serrated or have different types of margins?

Posted: 04 Jan 2020 04:24 AM PST

Is it possible for plants to survive in continuous light?

Posted: 03 Jan 2020 06:14 PM PST

Or do they require a darkness period? If so what is the reason?

submitted by /u/whatdoyouknowbud
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Why are flu vaccines limited to only 3 or 4 strains? Why not compound them from year to year so young people are protected against previous strains?

Posted: 03 Jan 2020 07:40 PM PST

Could enough of something with a low pH dissolve anything?

Posted: 03 Jan 2020 08:48 PM PST

Is elastic collision only possible for perfectly rigid bodies?

Posted: 03 Jan 2020 06:59 PM PST

My thinking was that during a typical collision between non-rigid objects that occupy some volume, the leading edges remain stuck together and in contact until the information that a collision has occured spreads to the entire object while it deforms and the object returns to its original shape after the information has traveled again from the opposite ends of each object to the colliding edges that the objects have finished exchanging momentum. During that entire timeframe, the objects are stuck together as the information travels and the objects deform.

With that in mind though, I was thinking that maybe the time where the objects are stuck together is avoided in perfectly rigid objects where the entire body instantly reacts to the collision, and thus it's an elastic collision.

submitted by /u/_Sunny--
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What happens when a Weak D blood transfusion recipient receives RH + blood?

Posted: 03 Jan 2020 05:54 PM PST

Why do psychiatric medications take so long to become fully effective (six weeks), while many other medications work within minutes or hours?

Posted: 02 Jan 2020 10:21 PM PST

Can a planet have a core made of diamond?

Posted: 03 Jan 2020 05:29 AM PST

I know that there can be a lot of pressure in the core of a planet, but can that pressure make a diamond? I think that if there was enough carbon in the core that it could compress to make a diamond, but would a planet like this (assuming it is rocky) be able to have life on it or be habitable?

submitted by /u/TheToucanPam
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On the topic of vacuum cleaner's: How does hose diameter affect suction?

Posted: 03 Jan 2020 08:54 AM PST

I'm perusing the selection of vacuum hoses and trying to find out the loss of suction that would occur in a 2-1/2" hose over a 1-1/4" hose. Both hoses for this example would be the same length, material, and be utilized with the same vacuum.

submitted by /u/Phil_bert
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As sea levels are rising, are we recalculating heights of mountains?

Posted: 02 Jan 2020 11:58 PM PST

Right now the change is not that big, but if a sea level rises, for example, 20 meters, are going to reduce the height of every mountain for 20 meters?

submitted by /u/vlad1m1r
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What is the cause of « natural death »?

Posted: 02 Jan 2020 08:34 PM PST

Hello to you all! I have always been wondering what do people die of when they are dead of « natural causes »? For example when someone dies in his sleep. Is it that his brain just stops working? Does he have a heart failure? Maybe another organ? Does the brain « forgets » to do something vital? Or maybe your body is just too weak and you die of disease? Or is just a combination of different problems? I really don't know and I would love someone to enlighten me

submitted by /u/timlegolas990
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Do bugs and other animals with really short life spans evolve faster?

Posted: 03 Jan 2020 07:07 AM PST

Friday, January 3, 2020

How do chemists produce a weakened state of a disease to create vaccines? How can they confidently determine the disease is ready to be used as a vaccination?

How do chemists produce a weakened state of a disease to create vaccines? How can they confidently determine the disease is ready to be used as a vaccination?


How do chemists produce a weakened state of a disease to create vaccines? How can they confidently determine the disease is ready to be used as a vaccination?

Posted: 02 Jan 2020 10:57 PM PST

I'm not antivax, I'm just genuinely curious and I can imagine a few methods how they would do this, but I'm wondering about the official method

submitted by /u/Mr_Spickles
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What are the colorful lines in NASA's Pale Blue Dot image?

Posted: 03 Jan 2020 01:06 AM PST

What was radioactivity called pre-Curie?

Posted: 03 Jan 2020 05:34 AM PST

Before Marie Curie coined the term "radioactivity," what was the term for that phenomenon?

submitted by /u/Draculalia
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Is there a theoretical limit to how much detail we can get from satelital images?

Posted: 02 Jan 2020 03:43 PM PST

The resolution you can get out of Google maps is pretty good, and we can make our individual persons most of the time. Will the technology ever get so good that we will be able to make out, say, an ant? If not, does the limit come from our technological capacity or is the limit a theoretical one, where it's physically impossible to get more resolution/detail?

submitted by /u/juanimapo
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How can a pregnant mother generate a sterile environment?

Posted: 02 Jan 2020 11:47 PM PST

I watched a Kurzgesagt video which said that human fetuses are in a sterile environment until they are born.

From what I understand about microbiology, creating a sterile environment is hard. Pressurized oven level hard. If I can wash my hands until I flay the skin from my fingers and still not get all the bacteria off, how can a mother generate such a large space of sterile room for an unborn?

submitted by /u/everburningblue
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Would a neck pillow soften the blow of whiplash or would the lack of free neck movement make the impact worse?

Posted: 03 Jan 2020 02:12 AM PST

Like in a car or plane crash. I'm just thinking like, when they say to brace for impact, if it is a good idea to keep your neck pillow on?

submitted by /u/alien_from_Europa
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What is the heat of vaporization for NaCl?

Posted: 02 Jan 2020 04:10 PM PST

I found that its boiling point is 1738K, but I can't find anything for its heat of vaporization. Wikipedia lists the heat of fusion, but not the heat of vaporization. Am I missing something?

submitted by /u/swimingduck
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Why is it in the movies when they wear bullet proof vests and get shot, they pass out or something and then wake up and reveal they were wearing a bullet proof Vest, why do they pass out?

Posted: 03 Jan 2020 12:47 AM PST

Is it possible to create an enzyme that breaks water into hydrogen and oxygen?

Posted: 02 Jan 2020 11:28 PM PST

How human milk is made? I mean all the way through: from food to bloodstream to mammary glands

Posted: 02 Jan 2020 02:42 PM PST

Is there a description of the whole process? I mean all chemical reactions, and how mammary glands extract nutrients from blood and convert them to milk and full understanding of how they work.

Also, are there machines which can turn food into bioidentical milk, let's say corn into human milk or grass into cows milk?

submitted by /u/karlrowden
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How are viruses fought? Which cells can attack them and which cells cannot? Why?

Posted: 02 Jan 2020 11:17 PM PST

Why does my marshmallow burn on the outside and not melt ?

Posted: 02 Jan 2020 11:11 PM PST

Can you measure the size of a galaxy using Cepheid variable stars?

Posted: 02 Jan 2020 03:36 PM PST

Specifically, could I measure the size of the Milky Way using the pulsation period of variable stars?

submitted by /u/CantaloupeFlamingo
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If enough asteroid mining is done and brought to earth, would it eventually start to change earth’s gravity pull?

Posted: 02 Jan 2020 07:43 AM PST

How steep must an incline be before you start to fall instead of slide down it?

Posted: 02 Jan 2020 03:47 PM PST

I've been curious about this for days and I can't seem to find an answer on Google. The logical answer would be a 90 degree angle but wouldn't an 89 degree angle still cause one to fall still? What about an 88 degree angle and on?

submitted by /u/mavyapsy
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How much water is on the moon?

Posted: 02 Jan 2020 07:36 AM PST

From some quick googling, I've found that evidence of ice was found on the moon, but I don't anything saying how much could exist.

With NASA's new lunar base campaign, it sounds like they're counting on significant amounts of water to be present in order to sustain a permanent base, and possibly having the moon as a fueling station using the water. What has been found so far?

submitted by /u/Arren07
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Are other animals apart from humans known to take and raise pets?

Posted: 02 Jan 2020 03:28 AM PST

Why does our brain need so many hours of sleep (1/3 of a day)?

Posted: 01 Jan 2020 11:40 PM PST

Why do we get congestion in our sinuses? Is this a defense mechanism of some sort? Not referring to the triggers, but why it even happens.

Posted: 01 Jan 2020 10:59 PM PST