Recent comments in /f/askscience

fiendishrabbit t1_j9tmiei wrote

Though not always. Had a colleague with hereditary PKD and an asymmetric progression (left kidney, non-functional and a huge amount of scar tissue. Enough that they had to remove it when transplanting. Right kidney had been pulling all the weight for the last few years and was now failing as well).

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lubacrisp t1_j9tmhnr wrote

Reply to comment by Edd1148 in Why is urine yellow? by nateblackmt

The breakdown of aspargusic acid into sulphur products that readily evaporate. Sone people can't smell the smell and some people can't make the smell. Both genetic markers

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OathOfFeanor t1_j9tm9gq wrote

Carbon nanotubes help us make the best concrete imaginable right now. They provide significant increases in tensile strength which is hard to achieve in concrete.

Concrete people will tell you about how "fiber mesh" (macro sized fibers of steel or composites) helps concrete.

Carbon nanutubes work the same way on the nano scale. Think about velcro. Which will be the stronger bond: fifty × 2-inch long velcro strands hooked together, or fifty trillion × strands that are each nanometers long?

One of the coolest things to me is how many shapes they can assemble the carbon into and how it affects the performance.

There are single-walled carbon nanotubes, multi-walled carbon nanotubes of a variety of designs, partially unzipped multi-walled carbon nanotubes which I think are the coolest, it's just insane. You look at these shapes and sure you could design them in 3D software but how the heck are they arranging carbon atoms in this manner? Cool stuff

Downside: This is pretty much only used in the research phase, no contractor in your town is using carbon nanotubes today. Construction is a VERY slow industry to adapt to something like this. We will see it in this progression, if it continues:

  • Research projects by Universities
  • Experimental civil projects by government entities (usually highway/bridge related)
  • Widespread use on civil projects
  • Maybe the cost comes down
  • Start to see it on commercial projects
  • Maybe the cost comes down more
  • Start to see it on residential projects
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AtrioventricularVenn t1_j9tlu18 wrote

We do have two hearts, one for venous (low pressure) flow and one for arterial (high pressure) flow. Also, each "heart" has its own secondary pump as an additional failsafe mechanism. This is the reason why heart defects or acquired issues can go undiagnosed for several years while the individual still maintains a healthy function.

You can argue that you have at least 3 brains: left and right hemispheres, and the cerebellum. Specialization gives these 3 structures functions and architectures that blur their independence from their counterparts. Damage to any of these structures can be compensated by the others but, of course, the level of compensation varies between individuals and age.

The digestive system is a completely different story because of how embryonic development works. We (and most animals) develop around a whole that becomes our single digestive tube (or tract). We are basically worms with funny looking appendages with wiggly tiny tentacles at their ends.

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oneAUaway t1_j9tlti0 wrote

Reply to comment by Edd1148 in Why is urine yellow? by nateblackmt

Asparagus contains a disulfide compound called asparagusic acid, whose metabolites produce the strong odor. Other foods with sulfur-containing compounds (such as cruciferous vegetables like cabbage and broccoli) can produce foul-smelling urine as well, though as u/Dubanx notes, there is a lot of variability in the production and experience of those odors.

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riuminkd t1_j9tl1h6 wrote

Do you realize that "slime mold solving maze" is literally just following the steepest gradient of smell/taste of whatever it is in the middle? There is no intelligence involved. And i don't think memory is considered to be a sign of any high intellogence

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tailuptaxi t1_j9tkuxo wrote

Reply to comment by [deleted] in Why is urine yellow? by nateblackmt

I also have no gallbladder. As I understand, its function was a reservoir for excess and it does not actually produce anything (except painful spasms when it has stones.)

The rest of the biliary system continues to function normally and the liver produces bile.

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wannabe-physiologist t1_j9tkqe3 wrote

Unilateral kidney failure is possible in cases of unilateral nephrolithiasis (kidney stones) however this would be painful enough to prompt someone to go to the ED where the imaging and labs others have mentioned will be done.

In the case of unilateral nephrolithiasis you would expect to see a patient with unilateral flank pain, CVA tenderness, and the urine studies would show red blood cells in the urine. This isn’t technically kidney failure per se, but is one of the ways someone without access to care may develop it.

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Alpacaofvengeance t1_j9tiyyt wrote

Reply to comment by berliniam in Why is urine yellow? by nateblackmt

> This urobilinogen oxidizes with air once you pee and converts to urobilin which has a yellow color

So is the pee in your bladder not yellow? Does this oxidation happen instantly while urinating? Or is there oxygen in your bladder which means the oxidation is happening there?

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Dubanx t1_j9ti5l8 wrote

It's important to note that viruses don't actually want to kill their host. A dead or excessively sick host is less likely to spread the virus to the next person. So viruses generally evolve to make its host sick without killing them.

The issue is that bats have a much heartier immune system than humans do. So when a virus adapted to living in bats jumps to humans, it's waaaay too virulent for the human body. It's not that bat viruses are more likely to infect humans than a cow virus or some other animal. It's just a lot more likely to be deadly when it does.

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Alphageds24 t1_j9thcra wrote

MIT did a study Study: Reflecting sunlight to cool the planet will cause other global changes

But it talks about aerosols in the air. So maybe burning them up the aluminum particles would be reflective aerosols?

A satellite reflecting sun back into space is probably very small amount of change, but with 30k maybe it adds up, I don't know.

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Dubanx t1_j9th5x6 wrote

Reply to comment by Edd1148 in Why is urine yellow? by nateblackmt

Funnily enough, both the ability to smell asparagus pee AND whether or not your pee smells from asparagus is genetic.

Many people can't smell it, and many others don't have pee that smells. A lot of people don't produce a detectable smell after eating it, but the people who claim to smell it have been scientifically shown to agree on which samples smell and which do not. So it's not psychosomatic either.

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PastGround7893 t1_j9tgrnh wrote

I don’t know much about metallic particle interaction, but I think it would be important to understand how aluminum interacts with Chlorine and copper piping/pvc piping because that’s where it will inevitably end up, making sure we understand how that affects the life span of copper piping particularly so we understand how much we affect our plans for infrastructure. It will undoubtedly shorten the life span of water infrastructure after enough enters water sources that are used for supplying homes/businesses with water. Not to mention the upkeep on the water plants before it enters main lines that will of course take more of a beating.

I don’t know the answers to that, let alone what kind of effects this has on an ecosystem, but I do know adding 28% to anything does indeed significantly change it.

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