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Monday, September 30, 2019

Why is there more matter than antimatter?

Why is there more matter than antimatter?

Why is there more matter than antimatter?

Posted: 29 Sep 2019 11:13 PM PDT

Why are certain chemicals carcinogenic? , for example Asbestos?

Posted: 29 Sep 2019 08:45 PM PDT

How does placing a block of iron on the copper hull of a ship prevent corrosion in the copper?

Posted: 29 Sep 2019 07:58 PM PDT

Or for that matter, why not metals like gold or nickel (as the block)?

Why not electroplate the iron onto the copper hull itself, and then electroplate zinc on that?

Why would a block of iron that does not cover all the copper stop corrosion in all the copper?

submitted by /u/doub-lehan
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How did NASA increase the weight limit of the LEM in the later Apollo missions?

Posted: 29 Sep 2019 05:03 PM PDT

I was watching From the Earth to the Moon recently, and in the episode where the first LM was built, the big problem in building it was getting it under the launch weight limit. How did the subsequent LMs seem to be much heavier than the first one (they were on the moon for longer, had a rover, etc.) Was the launch weight limit increased? or did they manage to keep the weight the same? Or was the episode just using that as drama?

submitted by /u/spc_pimpmotron
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Does my stove glow red when heated because of accelerating charges or quantum mechanics?

Posted: 30 Sep 2019 01:29 AM PDT

I've been hearing 2 explanations for why my stove glows red when heated.

First reason: Everything above absolute 0 gives off electromagnetic radiation. This is because accelerated charges produce radiation and anything with a temperature above 0K contains charged particles with changing velocities.

Second reason: When things get hot, atoms and molecules bump into each other. This excites the electrons into more energetic orbits and when they decay back into lower orbits, the excess energy is given off as discrete packets of electromagnetic radiation known as photons.

So, which is it? And if it is both, then in what way?

Bonus question: How is the black body spectrum continuous if quantum mechanics is discrete?

submitted by /u/GoGoGadgetDick95
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Why are CPU frequencies so much higher than GPU frequencies?

Posted: 29 Sep 2019 11:18 AM PDT

Most CPUs can reach 4.8+GHz easily, whereas most GPUs struggle to get 2+GHz, why is that?

submitted by /u/Edward_Elric64
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Could an H-bomb start fusion in its surroundings if exploded in a cloudy sky (and thereby cause more fusion to more of the surrounding clouds)?

Posted: 29 Sep 2019 10:00 PM PDT

Don't know if this the right place to ask this? Seeking on r/findareddit pointed me here.

Basically I wanted to know if its possible to start fusion reaction in a cloudy sky by exploding an H-bomb, and thereby causing more destruction to the land area right below the clouds (and far beyond). My gut tells me it's not possible, but couldn't find anything worthy on the internet to be sure.

submitted by /u/StrikeAsLightning
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Are electromagnetic waves getting weaker with distance in vacuum?

Posted: 29 Sep 2019 11:19 AM PDT

So does electromagnetic waves fade when they are travelling through vacuum?
Let's say we have point S (source point), A (10 units from source) and B (100 units from source).
At point S there is an AM transmitter that turns on and transmits on a certain frequency. At both point A and B there are AM receivers tuned to that frequency. Will the strength of this source signal be the same, regarding that distances between source are different for those two receivers?

What I mean - this EM wave generated by the transmitter is going in all directions from the source, forming a sphere and spreading through vacuum (at least that's the way I understand it). I also understand that those waves carry energy in some way (correct me if I'm wrong). As we get furtherer from the source there are more points where we can receive this wave (thus the energy it's carrying). So according to the law of conservation of energy this signal should be weaker on a greater distance because it spread on a bigger area.

But I guess that I got something horribly wrong in my way of thinking, so please show me where I made a mistake. Just to be clear, I've searched this on Google for a dozen of times but I couldn't find an answer.

submitted by /u/user-333
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Is the 'framerate' of our eyes greater in our peripheral vision compared to the 'frame rate' of our eyes more towards the center of our field of view?

Posted: 29 Sep 2019 02:54 AM PDT

I'm wondering if you would place a screen and play animations which have different frame rates (other parameters constant) would the frame rate of the animation at which you would perceive the animation as fluid be different to the frame rate if you would do the same experiment in the centre (or close to it) of your field of view.

Origin of the question: I was driving on public transport and noticed that the wheels of the car on the left of us, which was going at about the same speed, seemingly changed speed when I saw them at different angles of my field of view. Most noticeable was the change when the wheels were in my peripheral field of view. I tried multiple times.

submitted by /u/CircularPR
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The universe today is made of baryonic matter, dark matter and dark energy. How did they estimate the percentage of the universe that is made of dark energy?

Posted: 29 Sep 2019 12:44 PM PDT

I've seen this diagram before in various articles or videos: https://cdn.hswstatic.com/gif/universe-made-of-1.gif

I understand the way to estimate visible matter (starts, planets and other bodies).
I understand the "missing mass" problem and how they estimate the dark matter.
But how did they reach the ~70% estimation of dark energy? Why is it even there with other matter types?

submitted by /u/MindlessCalculator
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Why is it hard to predict a protein's tertiary structure if all you know is its primary structure?

Posted: 29 Sep 2019 12:40 PM PDT
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Sunday, September 29, 2019

Do we know about any objects that travel at large fractions of the speed of light?

Do we know about any objects that travel at large fractions of the speed of light?

Do we know about any objects that travel at large fractions of the speed of light?

Posted: 28 Sep 2019 06:03 PM PDT

We know that many particles travel at the speed of light, and sometimes I hear descriptions such as "these particle travel at roughly 0.5% of the speed of light" (paraphrasing, obviously). Do we know of any particles or phenomena that travel at, say. 50% of the speed of light, or some significant fraction?

submitted by /u/OLTARZEWSKT1
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Why have CPU clock speeds stopped going up?

Posted: 29 Sep 2019 07:06 AM PDT

You'd think 5+GHz CPUs would be everywhere by now.

submitted by /u/jjake101
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How do quantum dots (>20nm) absorve and release vidible light (<400nm) if they are smaller than the visible light wavelength?

Posted: 28 Sep 2019 06:46 PM PDT

Actually as I'm writing this question I also don't understand how we see materials, we do obviously see them but the atoms are smaller than the wavelength we see, so what is happening?

Can atoms emit wavelengths bigger than their size? How?

Or do we just see the cristaline structure of a bunch of atoms?

submitted by /u/mrBatata
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Since HIV-infected patients have such high levels of antibodies, how does the virus make progress at all?

Posted: 28 Sep 2019 08:21 PM PDT

My understanding of how HIV progresses is something like this (please correct me if I get something wrong):

Shortly after infection, patients experience flu-like symptoms for a few weeks. They feel better after that time because their body has produced a sufficient number of antibodies to prevent the virus from killing them. Untreated patients then feel fine for a long period of time (years or even decades) before developing opportunistic infections resulting from AIDS. These infections usually kill the patient within a few years.

My question is this: given that the human body seems to be capable of preventing the virus from destroying its host's immune system for several years, how does the virus make any progress? Why do the HIV-specific antibodies slow down the progression of the disease, but not stop it?

(Side note: With most viruses I'm familiar with, either the virus is eliminated or the host dies from the infection, with the main exception I can think of being the herpes virus. Does herpes stick around in the body for similar reasons? Or is this just a coincidence?)

submitted by /u/BrainEnema
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Is sexual orientation defined by genes? If so, how does it affect twins? If one of them is, say, homosexual, will the other be homosexual too?

Posted: 28 Sep 2019 07:13 PM PDT

What is so unique with HCl, why does it seems so versatile?

Posted: 28 Sep 2019 07:03 PM PDT

I use to just stereotype HCl (Hydrocholirde) as a cleaning agent (bleach) but recently came across to a lot of HCl derivatives especially in meds (Meperidine HCl, Isoxsuprine HCl, Hydralazine HCl to name a few)

How exactly does this work? What is with HCl?

submitted by /u/Zephynx4476
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How does Google know ‘what I mean’ when I misspell a word?

Posted: 28 Sep 2019 05:23 PM PDT

When testing rocket engines how are the engines secured so they don’t go flying off?

Posted: 28 Sep 2019 08:39 PM PDT

Whenever I see a video of a rocket engine being tested it's horizontal to the ground. How do they attach something that generates that much force/thrust to the ground so that it doesn't break the connection or fly off?

submitted by /u/bmh55
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Would traveling with a shockwave at the speed of sound do more damage to your vehicule/yourself than if it went through you?

Posted: 28 Sep 2019 07:42 PM PDT

I've been wondering about this for a while and can't find a proper answer. Sorry if I'm in the wronf subreddit!

submitted by /u/Zielko
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What is stopping us from building gamma microscopes?

Posted: 28 Sep 2019 06:07 PM PDT

They would have higher resolution than electron microscopes, which may give further gains in science.

I was also wondering if they would be able to see atoms.

submitted by /u/JoeyBobBillie
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Why does ice taste different to water?

Posted: 28 Sep 2019 07:54 PM PDT

This includes water that has just melted from ice. It has a very specific and recognisable ice-taste.

submitted by /u/tribalbaboon
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Do Palm Trees of All Varieties Have Long Strandy Leaves Because They Survive Tropical Storms Better?

Posted: 28 Sep 2019 07:12 PM PDT

Do Palm trees and other plants with similar leaves (and a strange lack of branches) actually survive tropical storms better than plants like oaks or maples whose leaves are more likely to catch wind and fall over? Or is it a coincidence?

submitted by /u/jim10040
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How strong is the pull of the Vacuum of Space?

Posted: 28 Sep 2019 07:07 PM PDT

A common cliche I've seen in space stories is the event of a breech in a ship's hull that leads to the empty vacuum of space and people have to hold on or get pulled through. My question is: How strong IS this pull? I feel it would be much stronger than what a normal human can resist with their bare hands. Does the size of a hole effect the pull or is it all the same pull? I would like to know the actual pull strength (if that's even measurable) of space's vacuum.

EDIT

As some people have pointed out, my use of the word "pull" should be "suction," as a vacuum doesn't pull so much as suck air out, which is what a person must fight to resist being sucked out into space. Also, in the question of pressure and air, it would say the conditions are identical as that found on the International Space Station.

submitted by /u/UndeadPriest94
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Can pregnancy hormones make straight hair curly or curly hair straight - all the way to long ends and not just the new growth?

Posted: 28 Sep 2019 07:01 PM PDT

I have been told and have also read many times that this is a possibility. But here is my problem with a blanket statement like that coming from a parenting article or my hair dresser: I understand that lots of things can change the shape of the hair follicle, which in turn changes the texture and curl pattern of the hair shaft. However, if a person already has longer hair ( mine, for example, is a few inches past my shoulders) I cannot understand how the shift in hormones under a less than one year time span, can affect the shape and texture of the hair shaft all the way to the bottom. New growth, yes. I can understand that. But now at 7 months pregnant, my hair is very wavy (about a 2B on the curl pattern chart) and is a shock to me and others who know me. But my thought is that it must have been leaning towards wanting to be wavy for years and I've only just decided to start encouraging the process and therefore, it has now seemingly sprung in to curls. Or, since the beginning of this pregnancy, the hormones have caused a shift in the shape of my hair follicle, therefore increasing the curl tendency in my new growth, which is helping to support the wave tendency in the rest of my long hair.

Is it possible for hormones to change curl structure all the way to the ends of hair which could have been growing for multiple years, and couldn't be affected by a hormonal change at the scalp in a short time period?

This is the most scientific article I could find on the topic, and it doesn't address the idea of long hair, just need growth from the follicle.

https://www.scienceworld.ca/blog/can-hair-change-straight-curly

submitted by /u/BesmirchedAnatexis
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Does each unique action (moving an arm, moving a leg, breathing) correspond to a unique brainwave?

Posted: 28 Sep 2019 06:58 PM PDT

Or is it more like, he is moving a limb type specific?

submitted by /u/IanGuard7000
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Is c÷(average wavelength) the same as the (average frequency) of a spectrum?

Posted: 28 Sep 2019 01:00 PM PDT

So, I'm having a little trouble here. I want to know the average energy of the photons emitted by a LED. What I have is the graph of intensity by wavelength.

​

I know that each point in the graph is actually the intensity integrated over a small interval near that point (analogous to a displacement vs time graph where each point is the displacement during a small time interval around that time).

​

But say that instead of that I had an actual continuous power distribution function, a graph now analogous to a velocity vs time graph. I must integrate the function over an interval of λ to find the intensity on that interval.

I'll call that function i(λ) (lowercase 'i' because that's not an intensity now but rather a "density")

I want to convert it to a function i(f) in such a way that the integrated intensity over an equivalent interval is the same, in other words

i(f)df = i(λ)dλ

Once f = c/λ -> df = (-c/λ²)dλ -> i(f)*(-c/λ²)dλ = i(λ)dλ -> i(f) = -(λ²/c)i(λ)

​

So I might choose i(λ) = kλ for example. 'k' is a constant that will deal with the units. And I might choose an λ interval from a to b meters. The integral of i(λ) will be (k/2)(b²-a²)

The frequency-domain function will be i(f) = -kλ³/c = -kc²/f³

The primitive integral of of that function is (kc²/2)/f² + C. Integrating from c/a to c/b (the equivalent interval in the frequency domain) the the result is (kc²/2)*[1/(c/b)²-1/(c/a)²]= (kc²/2)*[b²-a²]/c²
= (k/2)(b²-a²)

This is the same result and shows that the the power distributions check - They give the same total intensity for the same interval. Being that, obviously, each function have different units once they have different domains, but the units of the integrated intensity will be the same.

​

Now for the average value of wavelength and frequency:

i(λ)*λ = kλ² -> integral over the interval a to b = (k/3)(b³-a³)

dividing by the integral intensity we have (k/3)(b²-a²)/[(k/2)(b³-a³)] -> λ(av) = (2/3)(b³-a³)/(b²-a²)

​

i(f)*f = -kc²/f² -> integral over the interval of c/a to c/b = kc(b-a)

dividing by the integral intensity we have kc(b-a) /[(k/2)(b³-a³)] -> f(av) = 2c(b-a)(b²-a²)

If I took λ(av) and found the equivalent frequency, I'd have c/λ(av) = c(3/2)(b²-a²)/(b³-a³), which is not the same as 2c(b-a)(b²-a²)

For example, choosing a=100 m and b=300 m ->
λ(av) = (650/3) m,
c/λ(av) = 1383657.50 Hz, and
f(av) = 1498962.29 Hz.

They are reasonably close to each other but not equal

Is that how it should be?

submitted by /u/guferr
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Can we send radio signals at a fast enough speed or frequency so that they are in the visible light spectrum?

Posted: 28 Sep 2019 06:54 PM PDT

Have any studies tried to find correlation between heigh and average sunlight exposure?

Posted: 28 Sep 2019 06:13 PM PDT

I wondered if one exposed to more sunljght than a group with below average exposure, controlling for nutrition, in the ages of 14-18 would have found larger vertical growth over time, and potentially the ratio of sunlight to growth.

Vitamin D could be isolated for experimentation on height because currently the largest propagandist source for it is that it's from 'genetics' or DNA with no real credible sources viably identified as being the main source.

Thank you.

submitted by /u/WeAreElectricity
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Does schizophrenia alter the brain physically?

Posted: 28 Sep 2019 05:34 PM PDT

I'm thinking something along the lines of Alzheimer's or any other sort of neuro-degenerative disease. Does schizophrenia have any physical impact on the brain?

submitted by /u/YER_MAW_IS_A_ROASTER
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How does a stem cell transplant help with HIV treatment?

Posted: 28 Sep 2019 08:02 PM PDT

I heard that two patients were cured of HIV after radiotherapy and a stem cell transplant using a donor's stem cells? How does that cure the HIV? Could they have used their own stem cells rather than a donor?

submitted by /u/AverageVancouverite
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Is E. coli Turing complete?

Posted: 28 Sep 2019 07:39 PM PDT
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Saturday, September 28, 2019

AskScience AMA Series: I'm Kit Yates. I'm here to talk about my new book, the Maths of Life and Death which is about the places maths can have an impact in people's everyday lives. I'd also love to discuss my research area of Mathematical Biology. Ask Me Anything!

AskScience AMA Series: I'm Kit Yates. I'm here to talk about my new book, the Maths of Life and Death which is about the places maths can have an impact in people's everyday lives. I'd also love to discuss my research area of Mathematical Biology. Ask Me Anything!

AskScience AMA Series: I'm Kit Yates. I'm here to talk about my new book, the Maths of Life and Death which is about the places maths can have an impact in people's everyday lives. I'd also love to discuss my research area of Mathematical Biology. Ask Me Anything!

Posted: 28 Sep 2019 04:00 AM PDT

Hi Reddit, I am Kit Yates. I'm a senior lecturer in Mathematical Biology at the University of Bath. I'm here to dispel some rumours about my fascinating subject area and demonstrate how maths is becoming an increasingly important tool in our fight to understand biological processes in the real world.

I've also just published a new popular maths book called the Math(s) of Life and Death which is out in the UK and available to pre-order in the US. In the book I explore the true stories of life-changing events in which the application (or misapplication) of mathematics has played a critical role: patients crippled by faulty genes and entrepreneurs bankrupt by faulty algorithms; innocent victims of miscarriages of justice and the unwitting victims of software glitches. I follow stories of investors who have lost fortunes and parents who have lost children, all because of mathematical misunderstanding. I wrestle with ethical dilemmas from screening to statistical subterfuge and examine pertinent societal issues such as political referenda, disease prevention, criminal justice and artificial intelligence. I show that mathematics has something profound or significant to say on all of these subjects, and more.

On a personal note I'm from Manchester, UK, so it's almost a pre-requisite that I love football (Manchester City) and Music (Oasis were my favourite band). I also have two young kids, so they keep me busy outside of work. My website for both research and pop maths is https://kityates.com/

I'll be online from 8-9pm (GMT+1) on Saturday 28th September to answer your questions as part of FUTURES - European Researchers' Night 2019.

submitted by /u/AskScienceModerator
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How does cocaine get into the hair structure through use and environmental exposure?

Posted: 28 Sep 2019 07:17 AM PDT

I'm reading an article that was published in Analytical Chemistry that discusses the current methodology for forensic hair drug analysis in Europe.

The Society of Hair Testing says that hair samples should be prepped with an organic solvent wash followed by aqueous washes to remove contaminants.

However, a 3-year-old paper discovered that if the hair is somehow contaminated with cocaine (I guess either through lab error or maybe the person goes to places where cocaine particulates/vapor is in the air) the cocaine will permeate throughout the hair and present like user hair.

The authors looked at the cross-section of hair with a MetA-SIMS (TRIFT II TOF-SIMS) and compared it with conventional methods (LC-MS/MS). The contamination wasn't removed in the washes with organic solvents and water according to the LC-MS/MS, it permeated throughout the hair according to the TOF-SIMS.

I'm trying to figure out 2 things. One: How does cocaine chemically enter the hair if you're a user? Two: If cocaine hydrochloride (cocaine a rich person might buy) is water soluble, why isn't it coming out in the water? Why is permeating the hair further? (However this is also true for cocaine base, or "crack" cocaine. Though I'm having issues determining solubility with crack cocaine.)

FWIW, hair is composed of mostly keratin. Keratin is helical due to hydrogen bondings and has sulfate groups due to cysteine. Hair also has minerals due to diet and water, and contains lipids (cocaine vapor is lipophilic).

I'm finding a lot of speculation online and I was hoping for some more concrete cocaine chemistry. Thanks in advance.

submitted by /u/dumbquestion6669
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When I sleep with a bad pillow and spend all of the next day with a crick in my neck what has actually happened to cause such a pain in the neck?

Posted: 28 Sep 2019 03:14 AM PDT

Do a greater proportion of people have mental health disorders (diagnosed and undiagnosed) than 50 years ago? All mental health disorders or only some? For all ages groups, genders, countries? If so what is the likely cause, or why is there a perception that it is?

Posted: 27 Sep 2019 10:29 PM PDT

How did heavy metals arrive on Earth during planetary formation?

Posted: 27 Sep 2019 02:24 PM PDT

I understand that most heavy metals are created during supernovae and ejected during the explosion, but I'm not quite understanding as to how so much of anything metallic - especially elements higher in the periodic table - came to be part of the primordial dust cloud - a cloud composed of still so very much hydrogen that plenty of stars could form in our neighbourhood - that we have such a mix of elements here, and likely on any planet?

submitted by /u/JimBobBoBubba
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Is Language still evolving as fast as before? Or has the evolution of language slowed or sped up with modern globalization and standardization?

Posted: 27 Sep 2019 11:33 AM PDT

I saw a showerthought post about how 1000 years into the future people wouldn't be able to understand you or you them, and the same thread had some posts about how English 1000 years ago is completely incomprehensible to modern English.

I was wondering, with the advent of the Internet+Globalization (so no isolated pockets developing their own unique language because they're still always in touch with the parent language), and the general standardizing of languages via rules for grammar and spelling (rules that weren't really a thing 1000 years ago), what sort of effect has this had on language development?

Is language changing faster than before? Has it slowed? Are any particular languages (French, for example, which is known for strict standards in their language) changing slower than others?

submitted by /u/Athrowawayinmay
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Why does U-Pb dating have a limit of 500,000 years ago?

Posted: 27 Sep 2019 12:43 PM PDT

My book just says that you can use Uranium-Lead dating for samples that were formed up to 500000 years ago. Why does U-Pb dating have this limit?

submitted by /u/Gengumain02
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Where did native Americans come from?

Posted: 27 Sep 2019 03:18 PM PDT

If laurasia and gondwana split into the continents millions of years ago and Homo sapiens appeared first in Africa 200,000 years ago how did the red Indians get to America with no advanced ships or means of transport at that time while they were so primitive even at the time when the British got there

submitted by /u/Vonitae
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What happens to amputated body parts?

Posted: 27 Sep 2019 07:03 AM PDT

If someone needs a whole leg amputated, what is the process that severed leg goes through since its removal? What about other body parts like (for lack of a better example) the foreskin when people get circumcised?

Thanks.

submitted by /u/Brendanmicyd
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How do people die from severe burn injuries?

Posted: 27 Sep 2019 03:05 PM PDT

I get how you can die if you stay in the fire or axphiliate from the smoke, but what about those who die later in the hospital?

submitted by /u/purpleshep1
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Does my immunity to certain illnesses from being vaccinated also protect my newborn from the via breastmilk?

Posted: 27 Sep 2019 10:25 PM PDT

Sorry if it's worded weird but with the outbreaks of measles I'm concerned for my newborn, who is obviously too young for the vaccine. Is breastfeeding helpful in preventing her from getting an illness that she must be vaccinated against or is she just in danger until then? Sorry if it's an ignorant question.

submitted by /u/mckat2247
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Could you cause a dead bodies muscles to contract by electricly shocking them as you would with a living body?

Posted: 27 Sep 2019 04:17 PM PDT

How does improved cardiovascular endurance manifest physically in the body? Does the heart/lungs change at all in the way that a muscle gets larger with strength training?

Posted: 27 Sep 2019 11:01 AM PDT

What exactly is computer hacking? What is going on behind the scenes?

Posted: 27 Sep 2019 05:23 AM PDT

First and foremost: NO I am not asking for a set of directions or a guidebook on how to hack computer systems. But I am curious about what is actually happening behind the scenes when someone hacks a computer, network, or website. What is actually going on?

My only frame of reference would be locks. I am in to locksport and when I try and pick a new lock there is an opening that I can put picks in, feel the pins, and with some luck and patience and time, align the pins and pop the lock open. What is the equivalent in computer terms?

submitted by /u/gdaem
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Are there any examples of impractical side-effects of evolution?

Posted: 27 Sep 2019 08:39 AM PDT

I remember hearing something about the long stalks of the stalkeyefly. How they were important for males finding a mating partner. They are selected more often as mating partners which leaves their offspring (male or female) with long stalks too, even though the females don't really need them. I doubt this is the best example of what I am looking for, and want to know if there are examples from nature and evolution that "does the job", but is actually a bit of a hindrance for the animal in question.

submitted by /u/Chicken_McFlurry
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Why do cookies have crumbs?

Posted: 27 Sep 2019 09:59 AM PDT

Why do cookies have crumbs so large you can count them? Is there a reason they aren't small like sand?

submitted by /u/SovietTaters
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is it true, Lysosomal Storage Disorders happens due to inbreeding in human?

Posted: 27 Sep 2019 09:29 AM PDT

Is it possible to transfer immunity against viruses through bloody transfusion?

Posted: 27 Sep 2019 09:06 AM PDT

Is there a mechanism where immunity can be transferred through bloody transfusion and are there documented cases of this happening?

submitted by /u/sonomodata
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The United States cited presence of EMPTA in its bombing of the Al-Shifa pharmaceutical plant in Sudan in 1998. Are there any uses for o-ethyl methylphosphonothioic acid other than the production of nerve gas?

Posted: 27 Sep 2019 08:24 AM PDT

Blood donation after death?

Posted: 27 Sep 2019 08:18 AM PDT

Like organ donation, can blood be donated after death? And, if so, what is the period of time after death in which the blood is taken?

submitted by /u/theland_man
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Are there general patterns to where minerals and ores can be found on Earth?

Posted: 26 Sep 2019 09:46 PM PDT

I ask because I'm doing a speculative worldbuilding project with an Earth-like planet, and I want it to be as realistic as possible. Thanks in advance!

submitted by /u/way-too-much-effort
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