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Saturday, August 31, 2019

How/why did the Dancing Plagues occur? Why aren't there any dancing plagues (or similar) today?

How/why did the Dancing Plagues occur? Why aren't there any dancing plagues (or similar) today?


How/why did the Dancing Plagues occur? Why aren't there any dancing plagues (or similar) today?

Posted: 30 Aug 2019 08:47 PM PDT

How does your brain know which of your memories are real and which aren’t?

Posted: 31 Aug 2019 03:54 AM PDT

I'm laying in bed and just woke up from a dream where I placed an order for a new dining table. After I woke up from my dream it took a little bit of time for me to realize that I never actually ordered that dining table. How does my brain know my "dream memory" of me ordering that table didn't actually happen?

submitted by /u/NamBot3000
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How did carbon enter the ecosystem?

Posted: 31 Aug 2019 03:21 AM PDT

So there's a bunch of CO2 in the atmosphere, there's oodles of coal and oil under ground, and there's a lot of trees built by carbon.

But all that is just a cycle CO2 -> wood -> coal/ top soil nutrients. Also fauna will eat plant matter.

But how did it all start? Was there some single celled organism munching on graphite or something?

submitted by /u/Not_Michelle_Obama_
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On average, how much more do people actually eat when they purchase an all you can eat meal vs a regular one?

Posted: 31 Aug 2019 03:33 AM PDT

Why does water flowing down a street during light rain often propagate as wavefronts? (Video in text)

Posted: 31 Aug 2019 01:28 AM PDT

https://youtu.be/pIGg1z_h9a0

Something Ive been wondering with recent weather and don't really have a reasonable guess

submitted by /u/ApplePotatoStew
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Does the praying mantis actually hypnotize its prey; and if not, where does the rumor come from?

Posted: 30 Aug 2019 11:58 PM PDT

I'd genuinely like to know. I've personally seen them do this kind of thing to other insects. Is it just intimidation? Pheromones? An urban legend?

submitted by /u/AmarValdemar
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What was the general consensus on the movement of the Earth before Alfred Wegener came up with the continental drift theory?

Posted: 30 Aug 2019 11:19 PM PDT

I read on articles before that this theory, along with others during the age of New Global Tectonics, were once dismissed by academics. Also, Harry Hess' paper on seafloor spreading seem to confirm this by saying the same studies as "radical". If so, what did people think of the Earth back then?

submitted by /u/snapmares
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How does the conductance of an electrolytic solution becomes constant after increasing with the increase in temperature?

Posted: 31 Aug 2019 01:51 AM PDT

So with the increase in temperature, the number of ions increase due to increased dissociation and the motility of ions also increases. Hence, the conductance of the solution increases with the increase in temperature but when and how does the conductance becomes constant?

submitted by /u/Acetylated_Morphine
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Why were Carbon Dioxide levels so high in the Mid-Pliocene?

Posted: 31 Aug 2019 01:19 AM PDT

I have been reading about the recent findings of evidence for past high-level sea rise. A link to the main article I am referring to is here:

https://phys.org/news/2019-08-scientists-evidence-high-level-sea.html

This high level sea rise, they explain, aligns with the Carbon Dioxide levels of the Mid-Pliocene. The CO2 levels during this period, USF Department of Geosciences Professor Bogdan Onac explains, were, "the last time the Earth's atmospheric CO2 was as high as today".

Upon further research, I wasn't able to find a reason for why these levels were so high at this time in the Earth's history.

What caused CO2 levels to get this high 3 million years ago? It wasn't as rapid of a rise in CO2 as there has been in the post-indusrial era, right?

Perhaps the reason is insanely technical, or unknown, but either way I would love to know.

I may have gotten some of this info incorrect, as I'm not terribly educated in this sort of thing. Feel free to correct me!

submitted by /u/ChangeTheL1ghts
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How was Kepler-452b discovered, if it's about 1400 light years-away?

Posted: 30 Aug 2019 09:55 PM PDT

I'm aware that it's existence isn't 100 % proven.

submitted by /u/Aakoo7
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Why do your ears and nose continue to grow as you get older?

Posted: 31 Aug 2019 01:18 AM PDT

Why do whales breach? Is it to draw attention to themselves or to a certain area?

Posted: 30 Aug 2019 08:29 AM PDT

I never understood why they do that. It just seems like it takes a lot of effort on their part to do a "bellyflop"

submitted by /u/darklord1031
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How does counting in base 10 effect the way we understand and perform in maths and physics? Is there a more optimal base that would make “more sense” to use had we adopted it from the start?

Posted: 30 Aug 2019 04:55 PM PDT

Say humans evolved to have 12 fingers and our entire system of maths and physics was based around base 12, like my brain ceases up when trying to think about this stuff but wouldn't it have a major impact on how maths developed in the first place? for instance obviously physical laws would stay the same but now the numbers and constants would be different to us, would that even have an impact at all or am I just confused because I can't get my head around it?

submitted by /u/anus-in-the-brainus
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Why do scabs itch so much before they're ready to come off?

Posted: 30 Aug 2019 10:43 PM PDT

We've probably all experienced as a kid picking at an itchy scab and re-opening the boo-boo before it's healed. I am currently fighting this urge right now! Why does it itch so much when it isn't even ready to come off?

submitted by /u/riverturtle
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How could a clock run backwards?

Posted: 30 Aug 2019 06:48 PM PDT

So I just remembered when I was in 5th or 6th grade while I was typing something (can't remember, and it's not important) the clock in the room was running backwards several times faster than normal. You could hear it ticking fast too. It was noticed halfway through the class and shortly after the teacher took it down from the wall because everyone was distracted by it. Anyway does anyone know how this could happen. I'm fairly certain the clock was battery powered but the memory is kind of faint.

submitted by /u/K4505
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How come the same hematite (Fe2O3) can come in colors ranging from red to gray to black? Is it crystal structure, impurities, or non-stoichiometric composition that is the cause of color change?

Posted: 30 Aug 2019 01:58 PM PDT

How do the doctors figure out a prescription for baby glasses?

Posted: 30 Aug 2019 08:39 AM PDT

I've seen a lot of videos of babies getting glasses. How do the doctors figure out what prescription the baby needs? As an adult, there's a lot of guess and check in getting my prescription right, and they need continuous feedback from me. Is it a less exact prescription for babies? I know the machines they use before the guess-and-check get the prescription somewhere close.

submitted by /u/SaiNushi
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Does how much water flows through a filter affect how well it works?

Posted: 30 Aug 2019 06:29 PM PDT

When I was younger we got a faucet filter, and my dad used to say if you put the water on full blast it wouldn't filter as well.

submitted by /u/Panda_Lock
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Is there a political ideology where some things are government controlled while others are privatized?

Posted: 30 Aug 2019 05:24 PM PDT

If you ar riding a bicycle and then do a wheelie and Stop pedalling, will you go further than if you had just stopped pedaling?

Posted: 30 Aug 2019 05:09 PM PDT

What steps do doctors take to determine when someone has a new disease?

Posted: 30 Aug 2019 08:19 AM PDT

Friday, August 30, 2019

I don’t understand how AC electricity can make an arc. If AC electricity if just electrons oscillating, how are they jumping a gap? And where would they go to anyway if it just jump to a wire?

I don’t understand how AC electricity can make an arc. If AC electricity if just electrons oscillating, how are they jumping a gap? And where would they go to anyway if it just jump to a wire?


I don’t understand how AC electricity can make an arc. If AC electricity if just electrons oscillating, how are they jumping a gap? And where would they go to anyway if it just jump to a wire?

Posted: 30 Aug 2019 12:13 AM PDT

Why is the Earth not a perfect sphere? Is more gravity of a body required to become a perfect sphere?

Posted: 30 Aug 2019 05:27 AM PDT

How many bits of information transfer to a black hole via a single photon?

Posted: 30 Aug 2019 04:01 AM PDT

In a lecture by a rather famous physicist L.S. it was described that a single bit could be transferred to a black hole if the photon wavelength is equal to the radius of the black hole. In that case (as was proposed in the lecture) the location information of the photon is unavailable and the total information is just photon 'present or not'.

However is there not also information contained in the photon's polarization, angular momentum- is this information also transferred or unavailable?

submitted by /u/portablefilm
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What is the heat capacity of neutron stars?

Posted: 30 Aug 2019 07:25 AM PDT

What is the heat capacity of neutron star matter? Do we understand the equation of state of neutron star matter enough, to get a rough order of magnitude estimate of it as compared to say, liquid water?

submitted by /u/profdc9
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If you could hear sounds in space how long would it take for the sounds of the sun burning to reach Earth?

Posted: 29 Aug 2019 07:39 PM PDT

It takes about 8 minutes for light to reach Earth from the sun and if the sun were to die out we know about 8 minutes after it happened but since sound moves slower than the speed of light the sound of the sun burning would still be there even if the sun is out so basically what I'm trying to find out is that if the sun went out how long would we hear the sounds of the sun after it died out?

submitted by /u/LongLiveElon
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How do we manufacture only specific isomers/handedness of certain molecules?

Posted: 29 Aug 2019 04:15 PM PDT

My brother is allergic to one of the hands of albuterol, but the one that is only one handed is fine. Thalidomide was fine when it was only one hand but the other shape was the one that caused problems. How are we able to produce one specific one?

submitted by /u/sockpuppet229
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Can blood transfusions also transfer immunities?

Posted: 29 Aug 2019 02:31 PM PDT

Pretend for a second that you got dropped back in time, prior to the development of the Smallpox vaccine. If you drew out a vial of your own blood and injected that into another person, would you transfer your Smallpox vaccine immunity? Or is not enough antibodies carried in say a vial of our blood to do the trick? Curious and no amount of google-fu'ing seems to give me answer. Thanks!

submitted by /u/WeedsInMyMind
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What makes factoring numbers with over 232 decimal digits so complex?

Posted: 29 Aug 2019 07:43 PM PDT

How can volcanoes form where there are no plate boundaries?

Posted: 29 Aug 2019 08:26 AM PDT

In high school I've learned that volcanoes form on plate boundaries which I understand. But what I've been thinking about is how can volcanoes form where there are no plate boundaries. The main example I'm oging to use is in Edinburgh, where the Edinburgh castle is build ontop of an extinct volcanoe.

How did that volcanoe form if there are no plate boundaries in Scotland?

submitted by /u/biernat
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Is it possible for a conductive room temperature gas to exist?

Posted: 29 Aug 2019 10:01 AM PDT

More specifically is it possible for a gas to exist at room temperature and still conduct electricity relatively well.

submitted by /u/warpm00n
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Thursday, August 29, 2019

AskScience AMA Series: I am Joseph LeDoux, a neuroscientist at NYU. My research focuses on how the brain detects and responds to danger, and the implications for understand fear and anxiety. Ask Me Anything!

AskScience AMA Series: I am Joseph LeDoux, a neuroscientist at NYU. My research focuses on how the brain detects and responds to danger, and the implications for understand fear and anxiety. Ask Me Anything!


AskScience AMA Series: I am Joseph LeDoux, a neuroscientist at NYU. My research focuses on how the brain detects and responds to danger, and the implications for understand fear and anxiety. Ask Me Anything!

Posted: 29 Aug 2019 04:00 AM PDT

I am a neuroscientist, author, and musician. My research focuses on how the brain detects and responds to danger, and the implications for understand fear and anxiety. I am a member of the National Academy of Sciences, and have published hundreds of scientific papers, as well as several books for lay readers, including The Emotional Brain, Synaptic Self, and Anxious. My new book is The Deep History of Ourselves: The Four-Billion-Year Story of How We Go Conscious Brains. I also write songs for my band, The Amygdaloids, and the acoustic duo, So We Are.

I will be on from 3-5 ET (19-21 UT), ask me anything!

submitted by /u/AskScienceModerator
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What kind of impact does sleeping position and sleeping posture have on spine health?

Posted: 28 Aug 2019 09:34 AM PDT

Examples --

Position: Back, stomach, or side sleeping

Posture: Head turned to the side on back, knees position on stomach, hunched over with chin tucked in on side, etc. vs lying with the spine straight

submitted by /u/i_do_maths_not_words
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What food doesn’t come indirectly or directly from soil?

Posted: 29 Aug 2019 06:41 AM PDT

The FAO has a statistic that 95% of our food is either indirectly or directly from soil.

My lab mate and I are scratching our heads trying to think of foods that don't come from soil and we thought y'all might have better ideas than us.

submitted by /u/Lizz196
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WIMP detection: what's the current status, what are the proposed new experiments, and what are their improvements in the hope to detect what the previous ones missed?

Posted: 28 Aug 2019 01:10 PM PDT

There's a lot of info around the internet but not all of it is easily understood by those of us who are not in this field.

My current understanding is that the failure to detect them has put an upper bound on their weak interaction cross-section, is that correct? How will the proposed future experiments try to detect smaller ones?

Also, can you explain the neutrino background? I understand it would introduce a lot of noise in the data, but will it rule out the possibility of detecting WIMPS below a given mass/cross-section or will it just make it harder?

submitted by /u/katinla
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Do trees have a lifespan or are they immortal?

Posted: 28 Aug 2019 05:00 PM PDT

When charged particles spin, they exhibit magnetic or polar properties. If I spin a large body of a highly charged element on its axis fast enough(saying the material can withstand this) will it also exhibit these properties?

Posted: 28 Aug 2019 09:27 PM PDT

What mechanism leads people to demonizing ideological opposition? Having ideologically tight knit tribes makes some sense for survival, but why does it so quickly get to a point of demonizing opposition?

Posted: 28 Aug 2019 08:51 PM PDT

Has there been any research on the effectiveness of music on exercise and enhancing performance or temporarily improving the cardiovascular system?

Posted: 29 Aug 2019 06:57 AM PDT

Has there been any medical research done on seeing if there's any link or efficacy of listening to certain music that can help with physical exercise or improve performance and improve the cardiovascular system in anyway? I know this is just a colloquial example but I feel like when I exercise and listen to certain music it will get my heart rate up and I see a short burst of performance occur even if I'm tired or fatigued. I will be in the middle of doing a laborious task like rowing but if I listen to a certain song, I will be able to do it with more resolve than I could before.

submitted by /u/Bertrum
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Does greenhouse effect increase the albedo (whiteness) of Earth?

Posted: 29 Aug 2019 06:14 AM PDT

I am confused because to me it seems that gasses would not necessarily make Earth more black since they are colorless and transparent.

submitted by /u/hedup42
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Barotrauma: What happens when a diver is wounded at extreme depths? Would the pressure cause saltwater to enter the body?

Posted: 29 Aug 2019 05:59 AM PDT

This video of a diver getting attacked by a marlin got me thinking (apparently it only punctured the emergency pack). What if a diver received a deep cut or puncture wound at those depths? It would certainly cause freezing water to enter the diver's suit, but would it force its way into the bloodstream?

submitted by /u/tacomcnacho
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What happens when people train themselves to hold their breath longer?

Posted: 29 Aug 2019 05:54 AM PDT

Untrained people can typically hold their breath for around 1 minute, amateur divers for 3 minutes, professional divers for 4-5 minutes, and experienced freedivers for 7 minutes and more.

What does this "training" actually do to the body? I'm guessing it's not simply adapting to do the same functions with 7x less oxygen, because if that were possible, the body would be laughably inefficient to begin with.

submitted by /u/iwanttobepart
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Cable-stayed bridges seem to be being built more and more frequently, particularly for longer spans. What are the main advantages of the cable-stayed design over suspension bridges and cantilever bridges? And has there been a recent advancement that's driven the shift?

Posted: 29 Aug 2019 05:31 AM PDT

What are some ways of assessing UV damage on polymers?

Posted: 29 Aug 2019 07:04 AM PDT

I'm exposing rubber bands to UVC radiation. I already have two ideas in hand: 1. Microscopic analysis for damage 2. Checking the change in Young's modulus (would ideally reduce)

submitted by /u/VaccinatedApe
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How long does it take for an individual red blood cell to do half a body cycle (i.e. left ventricule through body vessels to right atrium)?

Posted: 29 Aug 2019 06:17 AM PDT

Upon what basis did Newton even believe the existence of the Philosopher's Stone (lead to gold)?

Posted: 28 Aug 2019 09:33 PM PDT

I really admire Sir Isaac Newton, but his alchemy really seems off the deep end (meaning: crazy).

Upon what basis would Newton assume that anything could turn lead to gold?

Am I right in thinking that it's similar to Newton's Bible studies? Both take information from the past and try to build upon it. People don't do alchemy today, but many people believe in the inerrancy of the Bible (as perhaps did Newton). Is it because the alchemists saw that people can turn two chemicals into another, and thus they see no bounds to doing so? And that: in the 1700's, they didn't have the periodic table structure that can show what can and cannot be done?

PS: the NY Times article on periodic table was what got me thinking of that today. I didn't find the answer in Reddit.

submitted by /u/PeterfromNY
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Can you slow a neutron till it stops?

Posted: 28 Aug 2019 10:59 PM PDT

Literature around nuclear reactors talks about moderating fast neutrons to slow them down. This seems to imply removing velocity, which suggests you could continue to apply this until the neutron stops (has zero velocity). Is this a thing that can actually happen or is this idea tied to my understanding of neutrons as tiny little balls whizzing about which is probably not reality.

If this is possible, can you continue to apply this process to many neutrons until you have a.. pile? of neutrons? just sitting there? Do neutrons decay or change into other things as they slow (eg, the concept of being a neutron is tied to its velocity?).

submitted by /u/Bergasms
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Oxygenated blood circulation without breathing?

Posted: 29 Aug 2019 02:44 AM PDT

First time posting, I did quickly read through the rules. I saw this scenario on a TV series I watched. Was wondering if it is at all possible, or if it is currently being used in the medical field, i.e. I just don't know about it.

Can a person receive constant oxygenated blood circulation (assisted by some medical device) without having the need to breathe? Is this how life support systems work? Can it be done while the person is conscious? While conscious, how would the person 'get past' his/her natural breathing instinct?

I did Google this and just got a bunch of health problem sites.

submitted by /u/CoffeeNinja1
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Why do JUNO's photos of Jupiter look so different from Galileo's? They almost look like paintings. Is it upgraded cameras, or the way they are processed?

Posted: 28 Aug 2019 06:02 PM PDT

Are nuclear weapons test safe?

Posted: 28 Aug 2019 02:44 PM PDT

Why is it that places like Chernobyl and the other plant in Japan are dangerous to visit for prolonged periods of time where as places like Hiroshima, Nagasaki and multiple nuclear test sites are safe to visit?

Isn't it technically the same thing, but one is a weapon and the other one is just being used for it energy?

Also, what about the nuclear fallout from atomic weapons tests? Doesn't the wind transport the nuclear particles?

I just don't understand why nuclear weapon tests are safe and the real thing is dangerous...

submitted by /u/biernat
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Will the continents shift, break apart, or change like they did with Pangea?

Posted: 28 Aug 2019 10:14 AM PDT

What makes the L4 and L5 Lagrange points stable?

Posted: 28 Aug 2019 08:54 PM PDT

For example, if a satellite is orbiting the Earth and some small outside force acted on it to push it a little closer to the moon, why wouldn't the moons gravity pull it closer and destabilize it?

Does being called "stable" just refer to it continuing without the outside force?

submitted by /u/Fibonacciscake
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Where does the snapping/cracking sound come from?

Posted: 28 Aug 2019 05:08 PM PDT

I'm not talking about finger snapping. I'm talking about the sound that breaking a twig or pencil or plastic or even a slab of ice. Where does that come from?

submitted by /u/kuyamj
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