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Tuesday, April 9, 2019

Do mosquitoes have a preference on blood type? Do some people have more “attractive” blood?

Do mosquitoes have a preference on blood type? Do some people have more “attractive” blood?

Do mosquitoes have a preference on blood type? Do some people have more “attractive” blood?

Posted: 08 Apr 2019 08:20 PM PDT

How was Pi "discovered" and how was it plugged into formulae correctly? How was it able to be used before the invention of calculators?

Posted: 08 Apr 2019 07:42 PM PDT

How are we able to take a picture of a black hole if they dont emit or reflect any light?

Posted: 09 Apr 2019 01:06 AM PDT

Is a picture of a black hole the correct terminology?

submitted by /u/xjinxxz
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Will all stars in the universe die eventually?

Posted: 09 Apr 2019 01:30 AM PDT

I always tought that even if a star dies new ones will take its place and this process can go on forever. So will the stars cease to form and every other one will die?

submitted by /u/australopitecul
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How large does a body of water have to be before rips/currents start to form?

Posted: 09 Apr 2019 05:01 AM PDT

How do eyelashes “know” when to stop growing?

Posted: 09 Apr 2019 05:29 AM PDT

What does the night sky of Saturn look like? [astronomy]

Posted: 08 Apr 2019 10:55 PM PDT

Can you see the rings? Do the moons look as big as ours in our night sky? What's the color of the night sky there?

submitted by /u/BarbD8
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What happens if you kick a ball in space ?

Posted: 09 Apr 2019 03:34 AM PDT

I am not any professional scientist but I am kinda inquisitive.I was wondering if the laws of newton ( Specifically the first law of motion ) would apply to any object in space.

submitted by /u/JustAnotherFunnyGuy
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What would happen if all of the emptiness of space was entirely filled with the air we breathe? Would there be any strange reactions or catastrophic things that would happen?

Posted: 08 Apr 2019 08:18 PM PDT

Why can't sulfate substitute sulfite in bisulfite test for aldehydes and ketones?

Posted: 09 Apr 2019 05:17 AM PDT

How do astronomers calculate the orbits of planets?

Posted: 08 Apr 2019 05:04 PM PDT

Is there just one equation that shows where a planet should be or is it more complex than that?

submitted by /u/chipmunk100000
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How the vaccine manufacturers verify if 100% of the viruses are inactivated into a vaccine? Its possible a active virus "pass" the inactivation in some way with the modern methods?

Posted: 08 Apr 2019 07:30 PM PDT

Europa (A moon of Jupiter) is said to be constantly bombarded by radiation from Jupiter, where does this radiation come from?

Posted: 08 Apr 2019 11:52 AM PDT

Why could trisomy 13 not be inherited, which mosaic trisomy 13 can be?

Posted: 08 Apr 2019 08:17 PM PDT

Thank you in advance.

submitted by /u/Hanson2258
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AskScience AMA Series: Upcoming breakthrough result from the Event Horizon Telescope

Posted: 08 Apr 2019 08:39 AM PDT

The European Commission, European Research Council, and the Event Horizon Telescope (EHT) project will present a groundbreaking result from the EHT on 10 April 2019 at 15:00 CEST. The press conference will be streamed live at eso.org/live.

Some of the scientists behind the result will be available for an AMA session on 10 April, at 20:00 CEST (14:00 ET)

More details about the session will be revealed on 10 April, at 15:07 CEST (9:07 ET).

submitted by /u/AskScienceModerator
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How does the uncertainty principal relate to quantum fields?

Posted: 08 Apr 2019 02:53 PM PDT

The uncertainity principal states that the more you know about the position of a particle the less you know about its momentum and vice versa but that doesn't state anything about fields. The uncertainty principal also has something to do with quantum fluctuations and non commutativity but I don't understand this part of it too well. I know position and momentum don't commute but I am not sure why

submitted by /u/182637777
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How exactly does exercise induced hypoglycaemia occur in Type-1 Diabetics?

Posted: 08 Apr 2019 04:54 PM PDT

There seem to be mixed opinions on this as well as conflicting information on how exercise induced hypoglycaemia is effected by different types of exercise (lower intensity such as jogging and high intensity such as sprinting). Some of the papers I don't have access to, either, which further complicates the topic and makes it difficult to get an overview.

Can anyone help out?

Many thanks!

submitted by /u/NT202
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What results from fusion of He-4 + neutron ?

Posted: 08 Apr 2019 12:40 PM PDT

The following fusion sequence is well known:

deuterium(d) + tritium(t) → helium-5 → helium-4 + neutron

In this process the unstable helium-5 isotope is a required intermediate step in the process, that is, the d+ t fusion event does not go directly to He-4 + n, first a He-5 isotope must be formed.

My first question is, is there experimental evidence for the reverse process ? If yes, during the fusion of He-4 + n is the unstable He-5 isotope observed or does the process go directly to d + t ?

Second question. He-5 is unstable to alpha decay but is there experimental evidence to show that it is stable to beta decay ?

submitted by /u/Loquadi
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How is the value of the US dollar calculated?

Posted: 08 Apr 2019 06:42 AM PDT

Why does glue not stick to the inside of its bottle?

Posted: 08 Apr 2019 09:28 AM PDT

How Does Global Warming Affect Hurricane Strength?

Posted: 08 Apr 2019 05:35 PM PDT

Does a hurricanes strength increase from higher ocean temperatures alone, or does it require an increase in the difference between ocean water temperatures and the hurricane system itself? If the latter is true does that mean that average ocean temperatures will increase faster than average air temperature?

submitted by /u/troubled_duck
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Monday, April 8, 2019

Will an Octopus Die If one or two of it hearts stop ? and Why ?

Will an Octopus Die If one or two of it hearts stop ? and Why ?

Will an Octopus Die If one or two of it hearts stop ? and Why ?

Posted: 08 Apr 2019 04:07 AM PDT

Vast swathes of North America used to be an ocean, the Western Interior Seaway. If this is true, why are those lands not salted and inhospitable like other dried saltwater bodies that have left behind only barren salt pans?

Posted: 07 Apr 2019 06:51 PM PDT

How far can the electricity spread when thunderbolt hits the ocean ? How close would you have to be to get hurt ?

Posted: 08 Apr 2019 08:27 AM PDT

Would it be more fuel efficient to only ever fill the gas tank halfway?

Posted: 08 Apr 2019 08:23 AM PDT

Gas must be pretty heavy, and adding that much extra weight into a car has to reduce the fuel efficiency to some extent. Would it be worth it to only ever fill the tank to half?

submitted by /u/arbitrary_aardvark
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What was the diet of early humans? How did they know what foods were safe to eat?

Posted: 07 Apr 2019 08:21 PM PDT

What did they survive off of on a daily basis and beyond that how did they know what plants were safe to eat?

submitted by /u/TehDMV
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Do quarks have an electric or magnetic field associated with their fractional charge state?

Posted: 07 Apr 2019 10:46 PM PDT

I've heard these quark things have a fractional charge, but do they have a magnetic / electric field associated with this charge?

Do they have a magnetic moment or electric moment?

If a quark is accelerated somehow, would it produce a electromagnetic wave?

Lastly, if you apply an electric field onto a proton, would the quarks polarize, like the way we learn that materials polarize when a constant electric field is applied across the material (the positive and negative charges move in a direction as to decrease the externally applied field)?

submitted by /u/datdutho
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Are languages changing/developing faster or slower than they have in the past?

Posted: 07 Apr 2019 08:43 PM PDT

What is the effect of pH on ion mobility?

Posted: 07 Apr 2019 05:30 PM PDT

I am interested in the physical and chemical mechanisms that come into play when analyzing the mobility of nutrients in soil for gardening purpose.

submitted by /u/ThePsymon
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In the new Netflix documentary called "Our Planet", a Western Parotia bird of paradise changes it's eye color from blue to yellow during a mating dance. How?

Posted: 07 Apr 2019 07:23 PM PDT

Even more strange, I can't seem to find any references to this eye color change anywhere else on the internet, and yet I just watched it happen several times in its full 4K HDR glory.

Can anyone elaborate on this phenomenon?

Edit to include video link: https://youtu.be/rX40mBb8bkU?t=135

submitted by /u/nklim
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Is there any limit to how powerful a cyclone (hurricane or tornado) can get before physics prevent further growth?

Posted: 07 Apr 2019 06:39 PM PDT

I've googled this a few times but a lot of the articles I found were not published by actual scientists nor did they feature any citations to scientist's articles. I figured since there's got to be at least a couple of meteorological super sleuths on here I could get a final, clear cut verdict. I don't care if there's no theory on this yet, simply knowing if there is and if so what the theory is would be pretty helpful for my amateur storm chasing and meteorological studies (I do this for leisure, I'm currently an undergrad in high school who just studies weather from inside his home in Missouri) and shed some light on what I could theoretically expect to see when a true monster strikes the heartland.

submitted by /u/EatThatPusi445
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In theory, would it be possible to create a whole other internet where the addresses don’t start with letters “www”?

Posted: 07 Apr 2019 02:24 PM PDT

What happened if you tried to exercise with early pacemakers?

Posted: 08 Apr 2019 03:18 AM PDT

Not 100% sure if this fits here because I'm not looking for numbers or figures, but I don't know where else to post.

Studying physiology homework and the textbook tells me that modern pacemakers will artificially increase your heartbeat during exercise.

That kind of implies that previous generations of pacemakers didn't do that.

So if my understanding of that is correct - what would have happened if you did strenuous exercise that had a higher oxygen requirement that would usually trigger a faster heartbeat? Would you just get tired very quickly? Would you pass out from lack of oxygen? Would your body react the same way it would to anaerobic exercise (say, behaving as if you're sprinting when you're just jogging)? Would you wind up with more lactic acid/muscle pain? Or would something else happen?

submitted by /u/Echospite
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How does a sociologist isolate socially constructed vs innate differences between behaviors of different sexes, races, ethnicity, etc?

Posted: 07 Apr 2019 04:44 PM PDT

So for example, there is a large difference between the occupations women tend to choose and the occupations men tend to choose. How does a sociologist decide whether the differences are due to social constructs or whether men and women naturally prefer different occupations?

submitted by /u/testudos101
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How does space debris impact earth's environment and atmosphere?

Posted: 07 Apr 2019 02:01 PM PDT

I know that it affects our space travel and satellites but does it have any affect on our environment on earth?

submitted by /u/XBlackRookX
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How does bacteria cause bleeding with a UTI (blood in urine)? Are they biting you?

Posted: 07 Apr 2019 06:02 PM PDT

How directly is the bleeding in a UTI caused by bacteria? Are they drawing blood directly from your ureter/bladder or are they causing irritation great enough to draw blood through some mechanism like a pH imbalance?

The reason I am asking is because I am picturing little bugs inside poking with something sharp to draw blood directly. How else would the blood get there/ where is it coming from? My friend is thinking it's indirectly produced from irritation caused by some protein/chemical imbalance caused by the bacteria but neither of us have medical/biology background.

submitted by /u/abwright
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Transparency: Pass-through or catch and release?

Posted: 07 Apr 2019 07:34 PM PDT

When photons traverse through a transparent substance, do they actually pass through without interacting with the substance, or are they absorbed and re-released with the same direction and frequency? If they just pass straight through, then what causes photons to refract (deflect off of their straight line path).

submitted by /u/The_camperdave
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Why does conductivity in a material (almost) always exclude transparency? What makes transparent and conducting materials different from usual conductors?

Posted: 07 Apr 2019 02:56 PM PDT

What “characteristics” allow cryopreservation of embryos to be “reanimated” in assisted reproduction, but make reanimating a cryo preserved adult human something that exists only in science fiction?

Posted: 07 Apr 2019 12:52 PM PDT

I have a rudimentary understanding that the main difficulty in cryo comes from the prevention of the formation of ice crystals which can damage cell membranes. Obviously an adult has orders of magnitude more cells, which means orders of magnitude more water which can damage cells when frozen and subsequently thawed.

Can someone explain why we are able to achieve one and not the other? Is the difference at a molecular/cellular/ macro (tissue) level?

submitted by /u/z3roTO60
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Sunday, April 7, 2019

What do swordfish use their sword for?

What do swordfish use their sword for?

What do swordfish use their sword for?

Posted: 07 Apr 2019 03:48 AM PDT

What mathematical language did Gerardus Mercator use to describe his projection?

Posted: 06 Apr 2019 04:10 PM PDT

In the Mercator projection, the y-position of a coordinate is given by the log of the tangent of its latitude. This was laid down in the 1500s. The concept of using functions to describe geometry came a bit later with Decartes, and the logarithm wasn't described until the next century either.

So what tools or language did Mercator use to describe how coordinates on his map could be constructed?

submitted by /u/iorgfeflkd
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What is the distinguishing factor between a forest and a jungle? Is it a climate thing? Type of trees?

Posted: 06 Apr 2019 06:07 PM PDT

If fever is used by the body to kill bacteria or viruses, does this not also damage the useful bacteria in the gut?

Posted: 07 Apr 2019 05:16 AM PDT

If you relocated a sea turtle's nest to a completely different location, would the babies return to where the mother laid them or where the human relocated them to nest?

Posted: 07 Apr 2019 04:20 AM PDT

What biological differences in some mammals allow for advanced movement very soon after birth?

Posted: 07 Apr 2019 07:43 AM PDT

For example, why can horse foals walk so soon after being born, versus human babies who require ~8-9 months before they can crawl, when horse gestation is only a couple months longer than human gestation?

submitted by /u/UPPERCASE_THOUGHTS
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Is the human ear more sensitive to certain frequencies?

Posted: 07 Apr 2019 07:51 AM PDT

I came across this website to test my subwoofers. I noticed that around 128 Hz, the sound becomes very loud compared to say around 142 Hz. I don't think the application is faulty, could it be that my ears just are more sensitive to sound at that frequency?

submitted by /u/Akainu18448
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How are entire ecosystems largely consistent between continents, but entire classes of animals therein aren't represented at all?

Posted: 07 Apr 2019 07:28 AM PDT

I was recently reading Teddy Roosevelt's The Wilderness Hunter, and an excerpt from the first chapter caught my interest:

"The untrodden American wilderness resembles both in game and physical character the forests, the mountains, and the steppes of the Old World as it was at the beginning of our era. Great woods of pine and fir, birch and beech, oak and chestnut ; streams where the chief game fish are spotted trout and silvery salmon; grouse of various kinds as the most common game birds; all these the hunter finds as characteristic of the New World as of the Old. So it is with most of the beasts of the chase, and so also with the furbearing animals that furnish to the trapper alike his life work and his means of livelihood. The bear, wolf, bison, moose, caribou, wapiti, deer, and big horn, the lynx, fox, wolverine, sable, mink, ermine, beaver, badger, and otter of both worlds are either identical or more or less closely kin to one another."

This is a really wide swathe of these biomes that has life similar enough to reside (in many cases) in the same genus and sometimes the same species. How is it that these areas can simultaneously be so similar, while in other areas - songbird populations, reptiles, etc. - they remain almost totally distinct? For instance, while both locations have rat snakes, that's an enormous subfamily of colubrids that often aren't all that similar. Similarly, both regions have vipers (family Viperidae) but the genuses are distinct and the animals are very different (Crotalus in NA; Vipera in EU).

In general, I don't think I understand why phenomena that allow genetically similar species to be extremely geographically distinct - such as land bridges and conjoined continents - have results that appear to be so selective.

submitted by /u/bibliophile785
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Why do levers work? Or in other words, why does work equal force times distance?

Posted: 07 Apr 2019 07:28 AM PDT

Every explanation I find about the principles of levers is that they apply the rule of physics that work equals force times distance. But why does work equal force times distance? What about the distance being greater increase the force that is applied?

submitted by /u/TheOnlyArtifex
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What causes the two big population spikes in China's population pyramid?

Posted: 07 Apr 2019 07:06 AM PDT

China's population pyramid is unique, as it has two large groups of people at the age 25-35 and 45-55. I would guess this has something to do with their one-child policy and their explosive population growth since the 1900s. but i haven't found any sources on this. Could anyone help me out?

submitted by /u/Kulfyr3
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Why do we sneeze?

Posted: 07 Apr 2019 01:09 AM PDT

How do astronauts suits protect them from extreme temperatures in space?

Posted: 07 Apr 2019 12:48 AM PDT

I'm curious to know what those suits are made out of and how they aren't affected by heat, cold, or even radiation when it apperintly can get pretty severe.

submitted by /u/XBlackRookX
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Why are steroids used to treat certain infections?

Posted: 07 Apr 2019 06:41 AM PDT

For example, part of the treatment for acute infective exacerbation of COPD includes 200mg IV hydrocortisone and 30mg oral pred but wouldn't these steroids have immunosuppressive effects - the last thing you want in an infection?

​

What's the logic behind this?

submitted by /u/Aristo_socrates
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How do volcanoes grow?

Posted: 06 Apr 2019 07:41 PM PDT

As I understand it, volcanoes grow as a result of pressure from magma below and the layering of ash and lava. However, from what I remember from school - this is a slow process. How can it compete with the massive losses associated with eruptions?

submitted by /u/deathkill3000
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Why are there no nuclei consisting exclusively of neutrons?

Posted: 06 Apr 2019 01:53 PM PDT

Why can we arrange colours in a circle?

Posted: 07 Apr 2019 12:22 AM PDT

As far as I understand it, colours are our perception of different wavelengths of light. There is a starting point at a low wavelength and an end at a high wavelength. By that, I have an intuition that there is a 'starting colouring' and an 'ending colour', with a gradient of all other colours inbetween. But yet we are able to arrange colours in a circle! Why is that?

submitted by /u/Galatheon
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How widespread were mental illnesses in the past?

Posted: 07 Apr 2019 03:58 AM PDT

People are always talking about how recently (due to things such as social media, isolation and higher social expectations) there has been a very large spike in mental illness.

But it's not like the past was exactly great either. Thinking back to 50 years ago, in real life bullying was (likely) much more prevalent, racism was everywhere, pretty much all minorities were hated (LGBT, people of colour, women, etc). Among other things.

Looking even further back into medieval times, on top of all the issues mentioned above, conditions were horrible for the vast majority of people, dictators were not at all uncommon, and things just in generally sucked.

So to me, I'd say overall compared to the past, despite technology, things seem like they have really improved in just about all areas. So it's hard for me to believe that mental illness is a lot more prevalent than in the past.

My hypothesis (keep in mind I'm not educated in psychology or history or anything like that) is that people have just been more accepting of people with these conditions and that are methods of detecting (and treating) these issues have improved massively, leading to more people being diagnosed. Not necessarily that there are MORE people with these issues.

So, how widespread were mental illnesses in the past?

submitted by /u/Sol33t303
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Why does bending the ring finger cause the middle finger and pinky finger to involuntarily bend also?

Posted: 06 Apr 2019 11:37 PM PDT

In the context of Astronomy, we often hear that space contains gases and dust. What is space dust and what is it made of?

Posted: 06 Apr 2019 11:24 AM PDT
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