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Monday, July 8, 2019

Do other Great apes pee holding their penises with their hands or is that just humans?

Do other Great apes pee holding their penises with their hands or is that just humans?

Do other Great apes pee holding their penises with their hands or is that just humans?

Posted: 08 Jul 2019 05:21 AM PDT

How does a fish know what kind of fish it is?

Posted: 07 Jul 2019 09:17 AM PDT

How does a sardine know to swim with other sardines and not pilchards, and tuna etc.

submitted by /u/Souprx
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Has home field advantage in sports ever been scientifically isolated/quantified?

Posted: 08 Jul 2019 07:04 AM PDT

I was wondering if there have been any scientific studies to identify/quantify what exactly causes home field advantage in sports.

​

Some sports, like baseball, have some built in advantages for the home team in the rules -- like batting last (you can play for exactly how many runs you need in the ninth) or tailoring/training your team to take advantage of the unique shape/dimensions of your home ballpark. Other sports, like basketball don't seem to have any advantage built in. There are no rules built in to help the home team and all courts/hoops/balls should be nearly identical.

​

Yet, all sports have a distinct home field advantage -- teams win more often at home than they do on the road and often have better metrics in other stats as well.

​

I'm assuming professional athletes aren't consciously trying harder at home than they do on the road, so the answer must be some combination of favorable game official treatment or subconscious performance enhancement/detraction due to (broadly) travel fatigue, fan noise/participation, or pride.

​

I'm assuming most of the above can be isolated and measured, so is there any scientific studies that have been done to that effect?

submitted by /u/MathW
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How will/are human bodies adapt(ing) to increased body fat if obesity continues through many generations?

Posted: 07 Jul 2019 09:34 AM PDT

Is there any evidence of human bodies adapting to obesity?

If it is true that you can be genetically obese then are those humans better adapted for this?

Would the human body be more likely to adapt to automatically store less fat, or to strengthen its organs/structure to be able to cope more easily with increased body fat?

submitted by /u/Qwobble
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Why do citrus fruits have dimples?

Posted: 08 Jul 2019 05:16 AM PDT

I understand the small dimples on eggs are for gas exchange, but why do citrus fruits like oranges and lemons have them?

submitted by /u/rideaselle
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How do bugs actually stick themselves and walk on walls and ceilings, y'know, like Spider-Man?

Posted: 07 Jul 2019 05:18 PM PDT

If we only started keeping temperature records in 1880, how do scientists know the world wasn't hotter before? How can they say so certainly the world is getting hotter and the ocean increasing?

Posted: 07 Jul 2019 02:05 PM PDT

Why do mosquito bites itch?

Posted: 08 Jul 2019 06:43 AM PDT

Do we know why humans and/or mosquitos evolved for their bites to cause itching? It seems like the mosquitos would benefit from it not doing so, so that people don't try to swat them, and for humans it doesn't seem to make a difference, since once they've already been bitten any disease carried would already be transmitted.

submitted by /u/nick_hedp
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If you are dehydrated, what part of your body will you start to deteriorate first?

Posted: 07 Jul 2019 02:13 PM PDT

How can 2x 1.5V batteries generate 4,000V of electricity?

Posted: 08 Jul 2019 05:48 AM PDT

Hi! Maybe a silly question, but there's something I can't wrap my head around. Just came across a bug-zapping device called a "Bug Warrior Supreme." Essentially a glorified bug-zapper in the shape of a tennis racket. They advertise as having "4,000V of pure bug zapping power," but I don't understand how that's possible with 2x 1.5V C cell batteries. Don't they only have a maximum output of 3V (1.5+1.5)? How can the 2 batteries deliver 4,000V?!

Thank you all in advance :)

submitted by /u/ShittyMcPoopus
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How have we discovered that water used to exist on other planets and their satellites?

Posted: 08 Jul 2019 05:09 AM PDT

Why can only non-accelerating reference frames be considered "stationary?"

Posted: 07 Jul 2019 02:02 PM PDT

When I'm falling why can't I say I'm standing still and earth is accelerating towards me? If I'm driving at a constant speed towards a city I can say I'm standing still and the city's approaching me. Thanks :D

submitted by /u/VioletBroregarde
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[Quantum Physics] Light being unable to escape a black hole?

Posted: 08 Jul 2019 04:11 AM PDT

Hello all,

Perhaps I've mis-remembered something but - The way wave-particle duality works with light is that - it will remain in wave form, traveling a the speed of light (without mass) and the waveform will collapse upon 'observation'.

This to me means one of the following things:

A: Our observation of event horizon of a black hole causes the waveform to collapse and particles to be absorbed

B: Black hole can pull waves into itself

C: Black holes 'pull' speed is so fast that technically the light red-shifts until it goes out of visible spectrum - without covering any of the distance due to moving opposite the black holes pull.

​

I don't know if any of the above are correct... Would someone be able to mildly clarify this for me?

​

Purpose of this question: I thought that massless 'entities' were unaffected by gravitational pull?

​

Thank you!

submitted by /u/fuzzout
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What is the chemical process of something "drying"? Wet clothes drying, spackle drying, paint drying...

Posted: 08 Jul 2019 03:42 AM PDT

Ringworld Paradox (theoretical limit to size and rotation?)

Posted: 08 Jul 2019 03:03 AM PDT

Is there a theoretical limit to the size of an object and how fast it can spin?

For example, could a star with a radius of 50,000km complete 1 revolution per second? The outer edge would need to be moving just faster than the speed of light.

Why would or wouldn't this be possible?

submitted by /u/badapple
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Is all of a person’s dna in every cell?

Posted: 07 Jul 2019 11:23 AM PDT

Ie in all cells is the complete set of chromosomes in the nucleus even if the cell's function is not being used by more than a tiny part of dna.

submitted by /u/bee4534
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What is the amplitude of a light packet represent?

Posted: 07 Jul 2019 10:35 PM PDT

So if we have a wave packet of light, one photon. It has a momentum, speed, energy all defined by its frequency/wavelength, and universal constants. But what does the amplitude of the wave represent?

submitted by /u/Vlad_Bush
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Are Natural Disasters and Global Warming related?

Posted: 07 Jul 2019 02:27 PM PDT

Recently I've seen an increase in natural disasters from earthquakes to tornados and I was just wondering if it has anything to the increase of Global Warming and Ozone layer depletion.

submitted by /u/GuiZapa368
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Why is it that climate scientists say that the global warming is irreversible?

Posted: 08 Jul 2019 01:35 AM PDT

Back in school I learned that warm climate periods where followed by ice ages because due to the warmer weather there would be more evaporation of water on earth leading to more clouds which causes that less sunlight reaches the earth. Why does this Not apply for man made climate change?

submitted by /u/GG_Blizzard
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What does "collision" mean with respect to uncharged particles?

Posted: 07 Jul 2019 11:27 AM PDT

Consider two neutrons unlucky enough to enter the same space at the same time--perhaps they are called "free neutrons". Can they literally bounce off one another in the billiard-ball sense? Do they touch at one single point (as two ideal spheres would)? Does the surface flatten a bit and spring back? Is the Strong Force "at" their surfaces interacting between them so as to repel them from each other without touching?

​

Or, as a matter of fact, does physical contact even apply to entities in the nano realm, where quantum effects dominate?

submitted by /u/losala
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Can we say that Young's Modulus of a material is equal to the Pressure required to deform a sheet of that material? I ask this because the dimensions of YM and pressure are the same.

Posted: 08 Jul 2019 12:21 AM PDT

Is it possible to estimate cooking time knowing three simple factors?

Posted: 08 Jul 2019 12:00 AM PDT

Weight of the item, current temperature of the item, and set temperature of the oven? Or are other variables necessary to more precisely estimate the time to transfer the heat?

submitted by /u/nobejube
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What affect does cloud seeding have on climate change?

Posted: 07 Jul 2019 08:09 PM PDT

If we add particles to a pregnant system to make it rain over an area in Colorado, does Iowa get less rain and as a result cause a drought for further eastern states? Do our climate change models account for human weather manipulation and the butterfly effect?

submitted by /u/futileargument
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Why do doctors prescribe antibiotics for viral infections (eg colds)?

Posted: 07 Jul 2019 08:15 AM PDT

I have read this is common in the US, with a high proportion of AB prescriptions for viral infections, like a cold. I was taught in school that ABs do nothing to viruses, so why do doctors give them out? Is it to placate the patient? What impact does this have on AB resistance?

submitted by /u/Icosahedonism
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Sunday, July 7, 2019

Can elephants breath through their mouth ?

Can elephants breath through their mouth ?

Can elephants breath through their mouth ?

Posted: 06 Jul 2019 09:10 AM PDT

Do the contents of our blood have any affect on mosquitos after they drink it? Do drunk people make drunk mosquitos?

Posted: 06 Jul 2019 09:09 AM PDT

Does Carbon-14 dating work for wooden objects submerged underwater? If so, how does it differ from testing things which are on land?

Posted: 06 Jul 2019 09:41 AM PDT

When seismic waves encounter a mountain range, do the waves continue along at sea level or do they travel up and down the mountain sticking towards the surface?

Posted: 06 Jul 2019 05:48 PM PDT

What is the radius of the targeting footprint of an average MIRV-capable nuclear ICBM?

Posted: 06 Jul 2019 03:51 PM PDT

I've been unable to find this information anywhere. I'm led to believe it's generally kept a secret. But I can't even find a guesstimate.

What I'm referring to is the geographical land area that the warheads from a single MIRV delivery vehicle can be targeted over once it achieves the peak of its trajectory. For example could a single missile direct warheads to both New York and Chicago, or is the footprint smaller?

submitted by /u/Dinyolhei
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How do nerves work exactly?

Posted: 06 Jul 2019 10:14 AM PDT

Since you never really touch anything and the sensation of touching is the force of your atoms pushing away from each other, what do the nerves "feel" or how do they work? Also how do we hold up objects if we never touch?

submitted by /u/All_Might_Senpai
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Are victims of sexual abuse more likely to identify as something other than heterosexual and if so, why?

Posted: 06 Jul 2019 06:55 AM PDT

I work at a residential boys home with DCFS (Division of Child and Family Services). Our boys are victims of sexual abuse and have been removed from their homes for this and often other reasons. This is probably the only trait they all share.

National stats say that about 5% of Americans identify as something other than heterosexual.

However, out of our 16 boys, 10 of them openly identify as something other than heterosexual. Everything from Bisexual to transsexual. And that number is fairly low. It's common for us to only have one or two who identify as, and behave as, heterosexual.

If their sexual identity was not at all tied to their past as victims of sexual trauma (again, the only trait I can think of that they all share), then you would expect their LGBT numbers to roughly match the national average because as far as that demographic is concerned, we'd be essentially taking a random sample from among them, but apparently we are not. The numbers hover more around 60-100% LGBT.

I realize that even if we take every kid Ive ever worked with over my years in this job, it would still be a small sample size, but its enough of a pattern that it makes me wonder if theres any sort of connection.

I remember a few years ago, there was a TIL that said that child victims of sexual abuse are 75% more likely to identify as something other than heterosexual, and theyre *usually* good about their sources there, but I cant find it now. Google only shows this article which is not exactly a reputable source and says that pedophiles target feminine children, but for some reason that seems unconvincing.

Can anyone shed some light on why victims of sexual abuse seem to be much more likely to identify as something other than heterosexual?

submitted by /u/Curlaub
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Does a computer do mistakes sometimes within the billions of operations they do every second?

Posted: 06 Jul 2019 03:43 AM PDT

It sounds insane to me such intricate circuits flawlessly execute all of these operations all the time correctly, but at the same time it also sounds strange to me the computer could function properly with mistakes within operations being a common thing. I don't think Fermi's approximation could work with computers, but I might be wrong.

PS. I don't want a yes or no answer, but an elaboration, please.

submitted by /u/bakedpotatos136
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What mechanisms occur during stratification of plant seeds (i.e moist cold, moist warm, etc), such as those from native wildflowers in northern climates?

Posted: 06 Jul 2019 11:32 AM PDT

Does anything happen to the topography of the sea floor when crude oil is removed from under it?

Posted: 06 Jul 2019 12:12 AM PDT

Do HIV attack b-cells and natural killer cells?

Posted: 06 Jul 2019 09:09 AM PDT

Does HIV attack b cells? And does B cells have TLRs? If so what type of TLR do they have?

The same question goes with Natural Killer cells, Does HIV attack natural killer cells? And do they have TLRs? If so what type of TLR do they have?

submitted by /u/Hazolmes
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Is there a minimum time we need to touch something in order for our brain to process it and make us feel it?

Posted: 06 Jul 2019 02:00 AM PDT

Like if we were to touch something or someone for only one femtosecond, would our brain even realize it? Is there a minimum time we need to touch something in order to feel it at all?

Does it make a difference whether this is something nice we feel (like the hand of a loved person) or something 'bad' like a pointy needle?

submitted by /u/Linnun
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Do nuclear fuel rods decay uniformly?

Posted: 06 Jul 2019 02:10 AM PDT

As I understand the whole point of a control rod is to limit the reaction by shielding some parts of the fuel more than others... wouldn't that cause the fuel to be spent unevenly? Do nuclear reactor operators rotate which control rods are utilized to even out the depletion? Or are the control rods pulled out progressively farther over time as the fuel decays?

submitted by /u/kaosatang
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How is dietary citric acid metabolised in the human body?

Posted: 06 Jul 2019 02:01 AM PDT

Does it have anything to do with the citric acid cycle, or is it processed some other way?

By glancing over the citric acid cycle, it almost looks like citric acid could be metabolised as a sugar, is that even possible?

submitted by /u/feitingen
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Saturday, July 6, 2019

How do we know the Mariana Trench is the deepest point in the ocean?

How do we know the Mariana Trench is the deepest point in the ocean?

How do we know the Mariana Trench is the deepest point in the ocean?

Posted: 05 Jul 2019 06:05 PM PDT

Pretty sure they taught this in school but can't seem to remember. If we haven't even explored the world's oceans in its entirety, how can we be sure that it's the lowest point? My uneducated guess about measuring the height of a mountain would be something to do with calculating the pressure and temperature (and density of air?) was modified to measure depths.

submitted by /u/buiXnL
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Many supermassive Black Holes emit relativistic jets. Would a White Hole be expected to have similar in-falling jets?

Posted: 05 Jul 2019 06:11 PM PDT

Could solar sails be used on a satellite to constantly accelerate it so that it would be able to travel to a nearby star much faster than would normally be possible?

Posted: 06 Jul 2019 07:19 AM PDT

Why does freezing kill most complex organisms, yet smaller organisms, like bacteria, will just go "dormant" and come alive again once thawed?

Posted: 05 Jul 2019 02:47 PM PDT

Why do berries in the same bunch ripen at different rates?

Posted: 05 Jul 2019 05:17 PM PDT

High heat or radiation can change the color of quartz varieties, can the same hold true in glasses?

Posted: 05 Jul 2019 07:22 PM PDT

I don't know alot about the physics of glass color, but as I understand it, heat and or radiation modify the color of crystalline quartz by impacting how impurities (generally metallic cations) are arranged in the silicon dioxide lattice (through changes in coordination number, etc). Glass is not crystalline, but often derives its color from similar impurities. When treated with high heat or radiation, would the color of common types of glass also change? Additionally, if there are types of glass that would react, would they "streak" when near strong particle emitters of radiation?

Thank you

submitted by /u/Pohatu5
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Are there "planes" in the ocean? Like a desert, but in the ocean, so flat expanses of ocean floor where little to no life dares to dwell or live?

Posted: 05 Jul 2019 10:11 AM PDT

Better explanation? Desert, but underwater.

submitted by /u/Anceintdan
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What makes our bodies stay at 98.6 degrees?

Posted: 05 Jul 2019 05:34 PM PDT

I may be asking a dumb question but, if we are constantly in air conditioned environments, at or around 74 degrees, why are we still at 98.6? I get like warm blood but what inside the body keeps us warm? Is blood just inherently warm or what.

submitted by /u/WineShrine
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How high is Mars' Olympus Mons really? What's the reference point?

Posted: 05 Jul 2019 10:39 AM PDT

We usually measure mountains' heights on Earth relative to sea level, with Mt Everest reaching about 8848 m (I heard it's recently grown to ~ 8849 m). But what's the frame of reference for mountains on dry planets, like Olympus Mons on Mars? It is a sort of absolute prominence relative to the lowest point on that planet, like comparing Mt Everest to the Mariana Trench? Or is it calculated from some other value, and in that case, what would be Mt Everest's height if not measured from sea level?

submitted by /u/DerelictBombersnatch
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What causes super flat objects to bond and what are the limitations of it?

Posted: 05 Jul 2019 02:24 PM PDT

Can a sensory neuron connect directly to a motor neuron (without a relay neuron in between)? If so, in what situations would it not be needed?

Posted: 05 Jul 2019 05:51 PM PDT

I know that the reflex arch is made of the sensory, relay then motor neuron but I'm not sure if the relay neuron is not needed in some cases.

submitted by /u/NathanTew
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Is there a way to slow down sodium acetate crystallization ? How to start reaction remotely?

Posted: 05 Jul 2019 03:48 PM PDT

Is there a way to slow down the crystallization of sodium acetate? Maybe by adding a different chemical?

Is there a way to start this reaction remotely? With electricity directly or with a solenoid? (with the solution in a sealed container)

submitted by /u/Mr-Wafffles
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Friday, July 5, 2019

Do black holes ever just chuck stars? Are there any stars that entered within the gravitational pull of a black hole and was just “slingshotted” across the galaxy? (That we know of)

Do black holes ever just chuck stars? Are there any stars that entered within the gravitational pull of a black hole and was just “slingshotted” across the galaxy? (That we know of)

Do black holes ever just chuck stars? Are there any stars that entered within the gravitational pull of a black hole and was just “slingshotted” across the galaxy? (That we know of)

Posted: 04 Jul 2019 11:09 PM PDT

Southern California Earthquake Megathread: Ask Your Earthquake Questions Here!

Posted: 04 Jul 2019 04:32 PM PDT

Hello AskScience! Today at approximately 10am local time, a 6.4-magnitude earthquake occurred in Southern California. The epicenter of the earthquake was in a remote area between Los Angeles and Las Vegas, though the quake was felt widely across the region. It is the strongest earthquake in the area in two decades. The AskScience team would like to extend our condolences to anyone negatively affected by this event.

We are here to answer your earthquake questions! Please post them below and our panelists will join in.

submitted by /u/AskScienceModerator
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Is there a reason why the more dangerous frequencies (UV, X-ray, gamma) and the "harmless" frequencies (radio, IR) on the EM spectrum are separated by the visible wavelengths?

Posted: 05 Jul 2019 07:48 AM PDT

Every reasonable person knows the Earth is not flat, but is there a maximum surface area you could sample where the Earth was statistically flat?

Posted: 05 Jul 2019 07:44 AM PDT

Do small animals get concussions (e.g. insects, small reptiles)?

Posted: 05 Jul 2019 08:31 AM PDT

Background: Massive (small) lizard in the house. My dad whacked it with a newspaper. Looked dead but not squashed. Thrown into the bin. Moments later, gone. Me go sleep. Me have nightmare. BIG lizard eating me up. SPOOK hence the question.

Thanks for all your input!

submitted by /u/auroraxan
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How hot does the backside of the moon get during a total solar eclipse?

Posted: 05 Jul 2019 07:47 AM PDT

How do varying peak amplitudes affect brain waves?

Posted: 05 Jul 2019 07:46 AM PDT

If i were graphing voltage against time for an experiment regarding a particular brain wave and various subjects recorded higher or lower peak amplitudes to an expected response, how do these extra or fewer volts affect the individuals brain and its processing?

submitted by /u/house_spider43
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How far does sunlight travel through the atmosphere when I watch the sunset?

Posted: 05 Jul 2019 07:44 AM PDT

Hi, I got curious during some research on Rayleigh-scattering.
I was wondering: If the sun appears red for us at sunrise and sunset, how much further does the light travel through the atmosphere for the shorter (blue-appearing) wavelenghts to be scattered to near-invisibility at mornings/evenings compared to noon?
Let's just say noon means the sun is in zenith, the relevant atmospheric thickness is 15km, the horizon is 10km away and earth's radius is 6370km.
I'm looking for the distance of an imaginery straight line between my eye and the top of the 15km high atmosphere, when the line is tangent to the 10km far away (from my eye) horizon.

I don't really know how to calculate the distance.
Any help is appreciated!
(please excuse any grammatical errors, I'm not native english speaking)

submitted by /u/SaItpeter
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What is the likelihood of dying during random point of your day? e.g: waking up, washing your teeth...

Posted: 05 Jul 2019 07:20 AM PDT

Why do antipsychotics increase the risk of death for the elderly with dementia?

Posted: 05 Jul 2019 06:51 AM PDT

Title. I see antipsychotic commercials on TV (like Rexulti) and I wonder why that class of drug is so deadly to the elderly.

submitted by /u/tachibanakanade
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What is "different" about a photon at the peak vs the valley of the wave?

Posted: 05 Jul 2019 06:42 AM PDT

Hi all. What is the difference in a photon's electric and magnetic properties (if any) at the peak vs the trough of the two aspects the wave? Does something different happen if a photon hits an object at the peak vs the trough? I'll thank you in advance though I have a feeling I'll have follow-ups.

submitted by /u/Kid_Charlema9ne
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What are the chances of a black hole being made from antimatter?

Posted: 05 Jul 2019 06:04 AM PDT

I've been thinking about the matter-antimatter discrepancy. How the Big Bang should have created both matter and antimatter in equal quantities, but the known universe contains only matter (so far as we can tell). After playing around with antimatter galaxies, I came up with the idea that black holes could be made from antimatter. Antimatter and matter explode violently upon contact, but nothing escapes the event horizon of a black hole (except Hawking Radiation). So if an anti-matter black hole captures matter, the explosion would be contained inside the black hole's event horizon and we'd never witness it.

I realize that this could only happen if antimatter reacts more strongly to gravity than matter, thus making it more likely to form black holes in the first place. I realize that my idea is almost certainly wrong and it would be much easier to explain why more matter than antimatter was formed from the Big Bang (although there's currently no widely accepted reason why this would happen). But if there is an antimatter black hole a) would we be able to distinguish it from a matter black hole and b) would the obliteration of the matter-antimatter explosion cause the black hole to decay, by say, reducing the mass of the black hole and causing the gravity to weaken?

submitted by /u/KnowanUKnow
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Are there any inherent issues with using tank tracks at high speeds?

Posted: 05 Jul 2019 05:51 AM PDT

Are tracks inherently limited to relatively slow speeds due to mechanical issues or is it more because the vehicles themselves are heavy?

Even the fastest tracked vehicles such as the M18 Hellcat, the BT-7 or the FV 107 Scimitar weigh multiple tons due to armor, armament and other equipment.

The question is, would it be feasible to create a "tracked sports car" with a lightweight chassis, a powerful engine and not much else to weigh it down or would issues with the tracks themselves (friction? wear?) effectively limit its speed?

submitted by /u/EyeofEnder
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What does light look like as it moves away from the visible spectrum?

Posted: 05 Jul 2019 01:04 AM PDT

Let's say that we have created a kind of diode that can put off light on one and only one frequency at a time. We also have a knob that can precisely control what frequency the diode is emitting. This diode can also emit Ultraviolet and Infrared radiation (what a nifty little thing!). Oh, and it puts off light at a brightness that can easily be seen by the naked eye.

My question is this: Given this hypothetical little diode, what would it look like as we turned the knob up to Infrared or down into Ultraviolet? Would the light just get dimmer and dimmer before going out? Since it is only emitting on one frequency, would it suddenly go out altogether?

submitted by /u/SuPeR_J03
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Is there a correlation between face shapes (oblong, oval, square etc) and body types (mesomorph, ectomorph, endomorph)?

Posted: 05 Jul 2019 03:51 AM PDT

What would melt faster? A spherical or cubic, ice cube?

Posted: 05 Jul 2019 02:42 AM PDT

My head hurts.

submitted by /u/endemalars
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Is planting trees really a viable strategy to combat climate change? Isn’t all the carbon they capture released when the die/rot?

Posted: 04 Jul 2019 10:27 PM PDT

This recent article tours planting billions of trees as an option to fight climate change. When these trees die and rot or burn, isn't all of the carbon they've captured throughout their life released back into the environment? If that's the case is planting trees really a solution to climate change?

submitted by /u/Civil_Discord
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Which is more 'fundamental' - wavelength or frequency?

Posted: 05 Jul 2019 01:05 AM PDT

When looking at the nature of things, I understand that wavelength is inverse to frequency (in terms of magnitude). However sometimes I see scientific explanations in terms of frequency and sometimes in terms of wavelength.

What I've trying to understand is whether one is a manifestion of the other, or are they both actually manifestations of a more underlying property?

submitted by /u/extra_specticles
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Do Pacific Islands archipelagos or island chains disturb the flow of ocean currents, or can ocean currents bypass the islands and not be weakened or change course because of the islands in their way?

Posted: 04 Jul 2019 07:44 AM PDT

I mean many small landmasses close together not a large landmass or large landmasses close to each other.

submitted by /u/RoderickBurgess
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Can tanks of rocket fuel, such as methane, liquid hydrogen, liquid oxygen, survive simply floating in space indefinitely, or on the surface of Mars, until they are needed? Or do they outgas completely at some point?

Posted: 04 Jul 2019 10:37 PM PDT

What distinguishes a tensor from just being a fancy way to define a matrix?

Posted: 04 Jul 2019 08:59 PM PDT

What does the LHC's security model look like?

Posted: 04 Jul 2019 08:19 PM PDT

What does the authentication/authorization process look like to spin up a run at LHC? Who has the rights to authorize firing the accelerator, either managerially or technically?

submitted by /u/wmjbyatt
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Rubbing these two metals together produces a sludge?

Posted: 04 Jul 2019 09:06 AM PDT

Hi,

​

I'm currently wondering why this happens over and over despite me cleaning those two metals every time. I'm fidgeting with two metals disks, rubbing them together with two fingers for no real reason. One disk is certainly made of Mu-metal or similar (Coming from a high-end speaker magnet. Is not a magnet itself.) and the other disk is made from a hard, cast iron (I can barely work it with a file), that is creating yellow salts in a oxalic acid peroxide solution. (I'm sure it's Iron oxalate) So it is mostly iron.

The Mu-metal disk does not stick to the other disk, but it does when I've rubbed them together until the sludge appears. It holds on when turned on top.

I am not touching the surfaces that rub together.

I also ruled out charges because I rubbed them together while having them both connected via a copper cable.

​

The "sludge" appears as a darker-than-the-metal coating/film that also feels fatty.

Kind regards

​

Edit: the Mu-metal disk could be coated in zinc. It is a pretty whiteish metal.

Edit2: Interestingly, one disk slowly glides down the other when there is enough "sludge" to hold the disk when turned on top. For some reason it feels odd how it glides down. It is a very constant and slow motion.

More: There is no magnetic attraction between the two at the point when they stick together. That's why I put this as a Chemistry question.

submitted by /u/Distelzombie
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