Is everyone's blood brain barrier equally permeable?

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• Is everyone's blood brain barrier equally permeable?
• Do anti-photons and anti-gluons exist?
• Why are DNA bases and RNA bases so different? How can removing a single hydroxyl group have such a large impact?
• Lasers and white light?
• If you take any colour and made it dark enough, would it eventually just turn black?
• What about different soaps allows them to form stronger/weaker bubbles?
• Why do spinning hub caps appear to spin in the opposite direction?
• Why can't we cut off the cirrhotic part of the liver and have it regenerate that way instead of having people die by keeping it in?
• What is the Banach-Tarski paradox?
• What is the difference between chirality and spin?
• With the Banach-Tarski paradox, isn't right up left the same as just up?
• Are all the space debris are likely to reenter the atmosphere due to orbital decay ?
• Relative to what point is the speed of light the "velocity limit"?
• Why do mutations in BRCA1 and BRCA2 predispose to ovarian and breast cancer only?
• Does light exerts a force?
• Which gases are we using for Joule-Thomson Effect?
• How can H-1 or H-2 go through radioactive decay if they only have 2 neutrons?
• Can we use the speed of light to establish a universal rest frame?
• Does acetic acid expand when frozen?

Is everyone's blood brain barrier equally permeable? Posted: 09 Mar 2016 11:13 AM PST submitted by /u/Drugs110 [link] [comments]

Do anti-photons and anti-gluons exist? Posted: 09 Mar 2016 12:14 PM PST If not, why not? submitted by /u/Nathan_Lawd [link] [comments]

Why are DNA bases and RNA bases so different? How can removing a single hydroxyl group have such a large impact? Posted: 09 Mar 2016 02:10 PM PST Considering the other groups in DNA bases I would expect that the hydroxyl group would be rather insignificant, yet DNA bases exhibit different chemical properties as opposed to RNA bases (ex: they're more stable) So why does removing this one hydroxyl have such a big impact on the molecule as a whole? submitted by /u/tdkreturns [link] [comments]

Lasers and white light? Posted: 10 Mar 2016 03:46 AM PST If you have 3 lasers - red, green and blue - and combine them into a single beam with mirrors, additive colour theory says you should then have a beam of white light. If you then split this with a prism, will you have the full spectrum or will it just be red green and blue? I know I'm probably wrong about the white light beam, but it makes sense in my head! Alas, I don't have the kit to try this myself or I would give it a go... submitted by /u/B0b_Howard [link] [comments]

If you take any colour and made it dark enough, would it eventually just turn black? Posted: 10 Mar 2016 04:26 AM PST submitted by /u/Jizzyface [link] [comments]

What about different soaps allows them to form stronger/weaker bubbles? Posted: 10 Mar 2016 05:20 AM PST I understand the basic chemistry and physics of bubble formation. The polar/nonpolar ends of the soap molecules form a bilayer with water or gas. The bubble breaks when the top of the bubble layer stretches too thin. My question is, what in the soap itself might affect its cohesive properties? Is there a difference between the actual soap molecules in different dish soaps? Please let me know if you need clarification as to what I am asking. EDIT: To clarify further, I'm asking about the intermolecular properties of different soap types/brands, as opposed to their interaction with other compounds. submitted by /u/gowronatemybaby7 [link] [comments]

Why do spinning hub caps appear to spin in the opposite direction? Posted: 09 Mar 2016 01:31 PM PST submitted by /u/BALTIM0RE [link] [comments]

Why can't we cut off the cirrhotic part of the liver and have it regenerate that way instead of having people die by keeping it in? Posted: 09 Mar 2016 10:44 AM PST submitted by /u/xRAPIERx [link] [comments]

What is the Banach-Tarski paradox? Posted: 09 Mar 2016 08:14 PM PST Re: https://youtu.be/s86-Z-CbaHA I don't understand the paradox here. Uncountable infinity divided by two equals uncountable infinity, that seems pretty obvious on the face of it. What makes this special? submitted by /u/darkbyrd [link] [comments]

What is the difference between chirality and spin? Posted: 09 Mar 2016 08:28 PM PST can a particle be in a superposition of left-hand and right-hand just like they're in a position of up and down? submitted by /u/chunkylubber54 [link] [comments]

With the Banach-Tarski paradox, isn't right up left the same as just up? Posted: 10 Mar 2016 12:05 AM PST In this video around 13:40 https://www.youtube.com/watch?v=s86-Z-CbaHA Vsauce is talking about points on a circle. He puts a dot at right up left and up but shouldn't those be the same position? He says nothing about the distance of each direction and I'm so confused. If the distance is not fixed, then there should be up, up, up, etc forever since up up would be redundant. Just one up could stand for all of them. submitted by /u/LockManipulator [link] [comments]

Are all the space debris are likely to reenter the atmosphere due to orbital decay ? Posted: 09 Mar 2016 10:23 PM PST submitted by /u/harry5519 [link] [comments]

Relative to what point is the speed of light the "velocity limit"? Posted: 10 Mar 2016 01:59 AM PST I have always been told you cannot exceed c. To what"stationary" point is the relative velocity c the maximum? I am not sure I have clarified the question sufficiently so I will explain what I was trying to think about in the first place. Consider launching a ship from earth. If it reaches a speed of c (or as close as we can achieve) away from earth in the direction away from the sun. We then launch another ship parallel to the first but after a quarter of a year (so the earth has completed quarter rotation and now has max relative speed in the opposite direction to the original ship route) is the maximum speed of the ship going to be the same as the first? When it gains max velocity would it keep a constant displacement from the first? Or would we have to say that it needs to "brake" first and then gain positive velocity due to the original negative caused by the earths rotation? If so then where is the zero point of movement as we are moving round the sun, the sun around the galaxy etc. I really do appolagise for the convolution of this question and am very keen to hear your answers! Many thanks to anyone who gives their time to deal with me!!! submitted by /u/whiterabbi [link] [comments]

Why do mutations in BRCA1 and BRCA2 predispose to ovarian and breast cancer only? Posted: 09 Mar 2016 11:33 AM PST I cant find any information on this and was wondering why mutations in the BRCA genes are (seemingly) only strongly linked to ovarian and breast cancer, given that these mutations are in a DNA repair pathway. Shouldnt they also be found in other cancers too? submitted by /u/UsernamesBeAwkward [link] [comments]

Does light exerts a force? Posted: 10 Mar 2016 12:12 AM PST We know that any object that has a mass, can exert a force, but does light has a mass and it exerts a force too? submitted by /u/rav22 [link] [comments]

Which gases are we using for Joule-Thomson Effect? Posted: 09 Mar 2016 12:25 PM PST What are the gases used in Joule-Thomson Effect and why are we using them? What is the difference between the gases we can use and we cannot? submitted by /u/baybarsa [link] [comments]

How can H-1 or H-2 go through radioactive decay if they only have 2 neutrons? Posted: 10 Mar 2016 02:37 AM PST So I get that it's unstable because it has too many neutrons, but this here (Uni material) says the atom has 1 proton and either 1 or 2 neutrons, so how can it remove neutrons and the nucleus rearrange itself to try and find a more stable form (radioactive decay), if it is only comprised of 3 things? submitted by /u/friendlyfitnessguy [link] [comments]

Can we use the speed of light to establish a universal rest frame? Posted: 09 Mar 2016 05:32 PM PST Since the energy required to accelerate is based on the current velocity could that be used to establish a universal rest frame? My thought process in case I am missing something: I am rotating around the earth, which is orbiting the sun, etc... Since I already have a velocity would it not be easier to accelerate in one direction and harder in another? I understand that assuming the cosmic microwave background is close to this, the earth's velocity is only about 371km/s which is paltry compared to the speed of light but would this be theoretically possible? submitted by /u/daed1ne [link] [comments]

Does acetic acid expand when frozen? Posted: 09 Mar 2016 06:43 PM PST Wikipedia's article on properties of water includes acetic acid in its list of "other substances that expand on freezing", but when I looked at wikipedia's acetic acid page it quotes the density of acetic acid as a liquid is 1.049 g/cm3 and as a solid is 1.266 g/cm3 which suggests it is denser as a solid so must contract. Clarification? submitted by /u/bobchuckx [link] [comments]

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If nearly 100 billion solar neutrinos pass through every square centimeter of our body each second, why don't these neutrinos convert neutrons in our bodies into protons, potentially harming us?

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• If nearly 100 billion solar neutrinos pass through every square centimeter of our body each second, why don't these neutrinos convert neutrons in our bodies into protons, potentially harming us?
• is there any other molecule/element in existance than increases in volume when solid like water?
• When an electron and a positron annihilate, two photons are formed. Why can't one photon be created?
• For every poisonous item on Earth, do we know it is poisonous because someone tried to consume it and died? Or is there a way to know a substance is lethal without the trial and error?
• Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
• [Astro] Does our Sun radiate anything else other than photons?
• Is there any evidence to support exercise helping to cure an existing minor bacterial or viral infection?
• During its creation, how exactly did the Earth cool down?
• If microwaves are non-ionizing, then why are they harmful to humans and radio waves aren't?
• Is the shape of a tree determined more by genetics or by the environment it lives in?
• If two solar sail crafts have perfect mirrors pointed at each other so that a laser beam will reflect between them indefinitely where does the energy come from to push them apart?
• What has a greater relative gravitational pull on us? The Sun or the Moon?
• In what ways/methods did humans change bananas from their natural form and why?
• Can liquid diamond be made and if so, what temperature would be needed?
• Which are the issues with a fractal based model of the distribution of mass in the universe?
• Would it be possible to use beams of neutrinos to image deep layers of the earth?
• Why is the eastern United States so different in climate compared to to the western United States?
• Does the brain control every process of your body?
• Do we have any statistics on the amount of the people with relatively common symptoms but with rare diseases that are mistakenly diagnosed, therefore uncured for long period?
• How did very similar trees/plants develop in the temperate and arctic zones in both the Southern and Northern hemisphere? Did seeds somehow get across?
• Do plants ever reject a graft the way a human will reject an organ?

If nearly 100 billion solar neutrinos pass through every square centimeter of our body each second, why don't these neutrinos convert neutrons in our bodies into protons, potentially harming us? Posted: 08 Mar 2016 03:24 PM PST From what I understand, neutrinos can strike neutrons and convert them into protons. If this happened in our body, in our atoms, couldn't neutrinos convert certain atoms into different atoms (as protons determine the type of atom) and harm us? submitted by /u/diavacado [link] [comments]

is there any other molecule/element in existance than increases in volume when solid like water? Posted: 09 Mar 2016 04:55 AM PST waters' unique property to float as ice and protect the liquid underneath has had a large impact on the genesis of life and its diversity. so are there any other substances that share this property? submitted by /u/xgladar [link] [comments]

When an electron and a positron annihilate, two photons are formed. Why can't one photon be created? Posted: 09 Mar 2016 03:50 AM PST I understand that two photons have to be created if the electron and positron collide head-on. In that case the total linear momentum is equal to 0 before the collision and to conserve this, two photons going in opposite directions have to be formed to keep the linear momentum equal to zero. But what if the electron and positron collide at an angle that's not 180 degrees, why can't one photon with more momentum be created? submitted by /u/Benbazinga [link] [comments]

For every poisonous item on Earth, do we know it is poisonous because someone tried to consume it and died? Or is there a way to know a substance is lethal without the trial and error? Posted: 08 Mar 2016 04:26 PM PST submitted by /u/charlesfries [link] [comments]

Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 09 Mar 2016 07:02 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary Science Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! submitted by /u/AutoModerator [link] [comments]

[Astro] Does our Sun radiate anything else other than photons? Posted: 09 Mar 2016 06:54 AM PST submitted by /u/Yrjosmiel [link] [comments]

Is there any evidence to support exercise helping to cure an existing minor bacterial or viral infection? Posted: 08 Mar 2016 10:30 AM PST Can you "sweat out" a cold, or the flu? Is the immune system positively or negativly influenced by excercise while sick? submitted by /u/Jesuslordofporn [link] [comments]

During its creation, how exactly did the Earth cool down? Posted: 09 Mar 2016 07:45 AM PST As far as I've known the heat energy from the creation of Earth has to go somewhere for Earth itself to cooldown. Where did all that heat go? submitted by /u/PaperMarz [link] [comments]

If microwaves are non-ionizing, then why are they harmful to humans and radio waves aren't? Posted: 09 Mar 2016 02:38 AM PST Is it because microwaves only in large doses are harmful, and radio waves are never in large doses? submitted by /u/bobicez [link] [comments]

Is the shape of a tree determined more by genetics or by the environment it lives in? Posted: 08 Mar 2016 04:47 PM PST How do the branches know where to grow? submitted by /u/not-a-tater-tot [link] [comments]

If two solar sail crafts have perfect mirrors pointed at each other so that a laser beam will reflect between them indefinitely where does the energy come from to push them apart? Posted: 09 Mar 2016 02:08 AM PST Sorry about the long winded question, I couldn't think of any ways to simplify it further. My guess is that the light will slowly be red shifted since I cannot think of any other way for light to lose energy. submitted by /u/colourcoded_ [link] [comments]

What has a greater relative gravitational pull on us? The Sun or the Moon? Posted: 08 Mar 2016 05:50 PM PST submitted by /u/lilybeans20101 [link] [comments]

In what ways/methods did humans change bananas from their natural form and why? Posted: 08 Mar 2016 03:55 PM PST I've seen it mentioned multiple times that the current image of a banana is vastly different from what their natural state is. While I understand the basic mechanics of how this can happen, I don't understand why it was necessary. Basically I'm looking for a rundown on the domestication and cultivation of bananas... submitted by /u/Kwad_Tahms [link] [comments]

Can liquid diamond be made and if so, what temperature would be needed? Posted: 09 Mar 2016 04:28 AM PST There gotta be some way or not. submitted by /u/priyobrotochak [link] [comments]

Which are the issues with a fractal based model of the distribution of mass in the universe? Posted: 08 Mar 2016 01:54 PM PST I was reading "Faster than the Speed of Light" from João Magueijo. He makes the following statment: (I read it in spanish, so you are seeing a double translation): Despite what I said when I presented the findings of Hubble, the most resounding evidence for homogeneity comes from cosmic radiation, as there is still a unique view on the catalogs of galaxies. In fact, a team of Italian scientists has analyzed the galactic maps and has concluded that, for all we know, the universe is not homogeneous but fractal. If this happens to be true, I recommend the reader to burn this volume, forget the big bang and start mourn. I don't understand why a fractal model of the (mass distribution in the) universe will imply a scientific problem; but quite the contrary as I think it will allow lot of predictions and understanding of nature. Magueijo does no elaborate on the issue with the fractal model, do you understand why it is bad? submitted by /u/cineto [link] [comments]

Would it be possible to use beams of neutrinos to image deep layers of the earth? Posted: 08 Mar 2016 12:26 PM PST I know that neutrinos very rarely interact with matter, but is there enough interaction to be able to at least gain some meaningful information about the center of the earth through shooting beams of neutrinos to detectors on the opposite side of the earth? submitted by /u/nagasgura [link] [comments]

Why is the eastern United States so different in climate compared to to the western United States? Posted: 08 Mar 2016 01:21 PM PST I'm talking little things like why does a town like Millers, Nevada have such a different climate than Charlotte NC (both roughly 300 miles from their closest ocean.) One is in a dry high desert while the other is a relatively hot and wooded region. There isn't a big north vs south difference yet they are so different from each other. submitted by /u/IrishBuckles [link] [comments]

Does the brain control every process of your body? Posted: 08 Mar 2016 02:44 PM PST Or do organs run pretty much autonomously? Does it depend which organ? Does the brain tell the intestines to move food through? Tell kidneys to process urine? Hair folicles to grow hair? submitted by /u/schoolboyfool [link] [comments]

Do we have any statistics on the amount of the people with relatively common symptoms but with rare diseases that are mistakenly diagnosed, therefore uncured for long period? Posted: 08 Mar 2016 01:40 PM PST Bonus question: how many were only correctly diagnosed after death? Ps: I'm a computer science guy. This is not for any kind of research/coursework. Simply a /r/Showerthoughts I had today. submitted by /u/criscmaia [link] [comments]

How did very similar trees/plants develop in the temperate and arctic zones in both the Southern and Northern hemisphere? Did seeds somehow get across? Posted: 08 Mar 2016 10:39 AM PST submitted by /u/sibeerian [link] [comments]

Do plants ever reject a graft the way a human will reject an organ? Posted: 08 Mar 2016 05:33 AM PST submitted by /u/kitzdeathrow [link] [comments]

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Maria Sharapova just got in trouble for using meldonium; how does this medication improve sports performance?

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• Maria Sharapova just got in trouble for using meldonium; how does this medication improve sports performance?
• The half-life of Hydrogen-7 is 21 yoctoseconds (21x10^-24s). How is that time measured?
• How legit is this article?
• Is gravitational time dilation near a black hole due to some intrinsic property of being deep in its gravity well or due to the relativistic speeds needed to maintain orbit around it, or both?
• Rocket science: Why cant you use liquid oxygen as a fuel in rockets, and why cant we use fluorine for a stronger oxidizer?
• What are the practical concerns which would prevent some hyperloop design from doing LA to NY in 16 minutes?
• Is it possible to slow down radioactive decay through cooling?
• Is it possible for a spinning black hole to stop spinning and become a non rotating black hole?
• During the process of bacterial conjugation, how is it decided which genetic material is transferred between the two bacterial cells? How can the cells determine what genes are beneficial for themselves?
• What stops an electron from falling into the protons within an atom?
• If electricity is generated by moving electrons, does the source of electric energy lose electrons over time? Does that have an impact at the source?
• If I shuffled a deck of cards, and dealt four cards, would the odds of getting four of a kind be lower than if I shuffled the deck of cards after each time I dealt one card four times?
• Are certain types of ailments or illnesses more prone to being cured by placebos than others?
• When a pregnant woman goes into labor, what is the proximate physiological change that caused the labor to begin? What mechanism if any functions as a sort of genetic clock for how long the baby will gestate and when this process will end?
• Is Visuo-spatial intelligence part of Fluid intelligence?
• Why is Pluto not considered a planet?
• How do OCPs treat endometriosis?
• If everything in the universe is moving, including us and our sun and galaxy, is it possible to calculate the absolute speed of any object?
• How does gravity/relativity impact my ability to see something?
• What things in nature are always almost the same size?

Maria Sharapova just got in trouble for using meldonium; how does this medication improve sports performance? Posted: 07 Mar 2016 09:23 PM PST Seems like it blocks carnitine synthesis. Carnitine is used to shuttle fatty acids into mitochondria where they are used as an energy source. Why would inhibiting this process be in any way performance enhancing? submitted by /u/npatchett [link] [comments]

The half-life of Hydrogen-7 is 21 yoctoseconds (21x10^-24s). How is that time measured? Posted: 07 Mar 2016 09:37 PM PST That's orders of magnitude less than an incomprehensibly short amount of time- I'm not even familiar with anything that falls between that and the Planck time, except maybe some stage of the Big Bang timeline. How do researchers figure out the half lives of isotopes of hydrogen that are on the yoctosecond time scale? submitted by /u/k-bo [link] [comments]

How legit is this article? Posted: 07 Mar 2016 06:25 PM PST I found this article published on Arxiv which claims to have found room-temperature superconductors. Obviously Arxiv is self-published and not as reliable as peer-reviewed journals, and the author withholds the exact composition and synthesis processes due to a "pending patent", but is there any chance this is real? submitted by /u/starwarsfan2160 [link] [comments]

Is gravitational time dilation near a black hole due to some intrinsic property of being deep in its gravity well or due to the relativistic speeds needed to maintain orbit around it, or both? Posted: 07 Mar 2016 08:58 PM PST submitted by /u/baksheesh77 [link] [comments]

Rocket science: Why cant you use liquid oxygen as a fuel in rockets, and why cant we use fluorine for a stronger oxidizer? Posted: 07 Mar 2016 11:10 PM PST submitted by /u/3thanguy7 [link] [comments]

What are the practical concerns which would prevent some hyperloop design from doing LA to NY in 16 minutes? Posted: 07 Mar 2016 11:58 PM PST LA -> NY: 4463.2 kilometers, using current roads as an approximation of the hyperloop's path. EDIT: I'd love to set the flair as both physics and engineering =/ submitted by /u/x-y-z-p-q-r [link] [comments]

Is it possible to slow down radioactive decay through cooling? Posted: 07 Mar 2016 06:54 PM PST Would it be possible to cool an element to where it will slow down the radioactive decay. submitted by /u/trewtrew1 [link] [comments]

Is it possible for a spinning black hole to stop spinning and become a non rotating black hole? Posted: 08 Mar 2016 12:17 AM PST Is it possible for a spinning black hole to just stop spinning but otherwise continue to be a black hole? submitted by /u/OrphanMeat338 [link] [comments]

During the process of bacterial conjugation, how is it decided which genetic material is transferred between the two bacterial cells? How can the cells determine what genes are beneficial for themselves? Posted: 07 Mar 2016 10:00 PM PST Any articles or papers you could provide on the subject would be greatly appreciated!!! submitted by /u/WhatevesReddit [link] [comments]

What stops an electron from falling into the protons within an atom? Posted: 08 Mar 2016 02:36 AM PST what stops the negatively charged atom from being attracted and falling towards the positively charged protons? submitted by /u/Obamanation_ [link] [comments]

If electricity is generated by moving electrons, does the source of electric energy lose electrons over time? Does that have an impact at the source? Posted: 08 Mar 2016 04:34 AM PST I'm asking this in relation to using the earths core as a source of electricity. Somehow if we are able to do it, would the flow of electrons out of this source mean there will be long term changes made to the earths physical core? Or is this anyway already happening whether or not we harness this energy? (Please pardon my ignorance, I'm making an assumption that the core can actually be used as a source of electrical energy like this, please correct me there if I'm wrong, but the original question is about the flow of electrons from a source and its repercussions to the source if any). Thanks! submitted by /u/tryingmyhardest88 [link] [comments]

If I shuffled a deck of cards, and dealt four cards, would the odds of getting four of a kind be lower than if I shuffled the deck of cards after each time I dealt one card four times? Posted: 08 Mar 2016 05:41 AM PST submitted by /u/Karmaa [link] [comments]

Are certain types of ailments or illnesses more prone to being cured by placebos than others? Posted: 07 Mar 2016 08:52 PM PST submitted by /u/eyephone314 [link] [comments]

When a pregnant woman goes into labor, what is the proximate physiological change that caused the labor to begin? What mechanism if any functions as a sort of genetic clock for how long the baby will gestate and when this process will end? Posted: 07 Mar 2016 11:43 AM PST My friend is pregnant and it's really interesting. Also if the proximate cause is something like, the body started producing some chemical then what is the cause of that? (I don't wanna keep asking why, but i figured it would be interesting for at least a few layers) So in joke terms, how does the body know the bun is done cooking? EDIT: I'm not only interested in humans, so if a scientist who studies other mammals knows about that I'd be down to hear about it. submitted by /u/arealllama [link] [comments]

Is Visuo-spatial intelligence part of Fluid intelligence? Posted: 07 Mar 2016 05:58 PM PST Fluid intelligence is not thoroughly defined. For example, a lot of visual matrices that involve mental rotation are supposed indicator of Fluid intelligence. However if they also measure visual memory and mental rotation, are they not also measuring visuo-spatial intelligence? If so, does that mean Gv is part of Gf? submitted by /u/blackjack0123 [link] [comments]

Why is Pluto not considered a planet? Posted: 08 Mar 2016 03:04 AM PST Pluto is considered as a dwarf planet. Earlier it was included in the list of planets then why now it is not in the list? Does it lack the qualities needed for a celestial body to be a planet? If yes, then what qualities? submitted by /u/Neer29 [link] [comments]

How do OCPs treat endometriosis? Posted: 07 Mar 2016 06:39 PM PST I'm getting a little confused on female reproductive hormones. This is what I think I know: FSH --> follicle growth --> increased estrogen --> endometrial growth LH surge --> ovulation --> formation of corpus luteum --> secretion of estrogen and progesterone progesterone: glandularization/vascularization of endometrial tissue blocks further growth of endometrium by estrogen by blocking its effect, not by down regulating estrogen production So progesterone contraceptives treat endometriosis by blocking estrogen-driven growth of endometrium? This brings me to two more questions: how do oral contraceptives exert their effect? estrogen --> down regulation of FSH and LH --> prevention of follicular growth and ovulation? progesterone --> prevention of estrogen driven endometrial growth? how does menses occur? corpus luteum dies --> decrease in progesterone --> increase in prostaglandins --> vasoconstriction --> endometrium dies off? does the drop in estrogen play a role in menses? Thanks for any help submitted by /u/gorightthroughformsu [link] [comments]

If everything in the universe is moving, including us and our sun and galaxy, is it possible to calculate the absolute speed of any object? Posted: 08 Mar 2016 01:55 AM PST submitted by /u/_inkrypted_ [link] [comments]

How does gravity/relativity impact my ability to see something? Posted: 07 Mar 2016 03:51 PM PST In the film Interstellar they visit a planet near a black hole. One crew member stays behind on the ship, and time moves differently for him then those on the planet (1 hour on the planet is 7 years for the person on the ship). If he had a telescope strong enough to see the surface of the planet, what would he see? submitted by /u/Hanasmf [link] [comments]

What things in nature are always almost the same size? Posted: 07 Mar 2016 08:09 PM PST in ancient and medival times things were often measured by body parts. although that was practical measures vary from person to person. later there were prototype measures but those are arbitrary, difficult to copy exactly and not replaceable when lost. are there non microscopic features in plants, animals or materials that always are always the same size and only differ by a very small amount? if not are there simple experiments that allow to create a measure with primitive technology? submitted by /u/elypter [link] [comments]

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