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Sunday, August 11, 2019

What would daily life on Earth look like if there were two moons?

What would daily life on Earth look like if there were two moons?

What would daily life on Earth look like if there were two moons?

Posted: 10 Aug 2019 01:18 PM PDT

I've always learned that the tidal pull of the moon has made life on Earth possible. Beyond the tides themselves being important for many ecosystems, it is also my understanding that without the moon there wouldn't be ocean currents (correct me if I'm wrong). Without ocean currents stirring arctic and tropical waters, the weather would be a lot less predictable, and the Earth would be generally less habitable.

My question then is, how would two moons (for argument's sake let's say of relatively equal mass and rotational period) impact the tides and the currents? Would the pull of the two moons cancel each other out, leaving us in a tideless wasteland similar to if we had no moon at all? Would the tidal forces just be amplified by the second moon? Or would something else entirely happen? Thanks in advance for your replies!

submitted by /u/flabby_kat
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is there a proof why nubers are dividable by 3 if sum of their digits is dividable by 3?

Posted: 10 Aug 2019 04:09 PM PDT

so my question is this: i would like to see the proof how we know for certain that this rule works for every number. i dont know how to explain the rule.

rule being that number 261 is dividable by 3 because 2+6+1=9 and number 9 is also dividable by 3.

hope i explained it good enough. I am sorry for lacking english speaking/writing skills

submitted by /u/jevnik
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How far back in time could you go before the night sky started to look different?

Posted: 10 Aug 2019 09:04 PM PDT

What exactly is a vitamin? And how did we determine which ones are necessary?

Posted: 10 Aug 2019 01:53 PM PDT

What causes the Latency Period in Acute Radiation Sickness?

Posted: 11 Aug 2019 05:28 AM PDT

Severe radiation sickness, from what I understand, has an initial prodromal phase, followed by a latency period, and then the overt phase (https://rarediseases.org/rare-diseases/radiation-sickness/).

My question is what causes that latency period in between? Why does the patient seem to "recover" shortly after exposure?

Flairing as medicine, but maybe it's more of a Physics thing?

submitted by /u/cow_co
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Is all muscle soreness rhabdomyolysis?

Posted: 11 Aug 2019 03:23 AM PDT

Is it possible that even mild or a normal amount of soreness after a workout is because of a mild form of rhabdomyolysis? If that's what happens, do muscles still adapt and grow regardless of the rhabdo? Also, what causes rhabdo during exercise? Is it from tensing the muscle for too long and blocking the bloodflow and oxygen causing cell death? Thank you for your help

submitted by /u/FBI-Agent69
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What happened to Supersymmetry?

Posted: 11 Aug 2019 02:44 AM PDT

I haven't been following Supersymmetry at all but I have noticed that it's not mentioned quite as often as before.

submitted by /u/the-original-smartas
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What causes the skin to swell after bitten by an insect?

Posted: 10 Aug 2019 10:37 PM PDT

Any detailed explanation or a link to any article would be helpful.

submitted by /u/ligma-8alls
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[Climate]Why are tornadoes so rare in Europe, but almost "common" in North America (US in particular)?

Posted: 10 Aug 2019 10:55 AM PDT

Tornadoes are rare in Europe, so two tornadoes (Luxembourg and Amsterdam) on the same day is even rarer. In the US, while we don't have tornadoes everyday, we have them often enough, usually over 1000 a year. Why do we have so many. Even Canada has only ~6% of the number than the US recieves? (no data on Mexico) Entire continents have fewer per year than the US racks up. Shouldn't Asia and Europe have their own Tornado Alleys?

submitted by /u/Swiggy1957
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Do apes make music?

Posted: 10 Aug 2019 04:05 PM PDT

Do other apes use their voice or primitive percussion instruments to make music or is music unique to humans? And if so, when was music most likely first created?

submitted by /u/TeusV
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What is the point of Oxygen in a Hydrogen-Oxygen fuel cell, and what catalysts are usually involved?

Posted: 10 Aug 2019 06:17 PM PDT

I am reading on fuel cells and the following is my understanding:

H2 gas reacts with a catalyst (usually platinum) at the anode, ionizing the molecule; the ions are allowed to travel through an intermediate substrate toward the cathode, but the electrons must go through a wire creating a current (current is source of power output) . And finally, the electrons, O2, and hydrogen ions react with one another to form water.

Now, what is the point of the oxygen here? Couldn't we just combine the hydrogen gas with the electrons once again? Is the oxygen being ionized at the cathode? If so, what is its catalyst?

Thanks in Advance

submitted by /u/pepesilvia27
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When and how did we learn the position of the planets in the solar system?

Posted: 10 Aug 2019 06:48 PM PDT

For example in what year did we found that Jupiter is the 5th planet from the Sun? How did we learn that Saturn was similar in size but even further and in the 6th position?

submitted by /u/-Hastis-
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Why can you get two answers (one obviously false) from manipulating x=x+1?

Posted: 10 Aug 2019 01:19 PM PDT

So obviously x=x+1 is not true for regular numbers, but if you manipulate it, you can get -0.5

 x=x+1 x^2=x^2+2x+1 0=2x+1 -1=2x -1/2=x

Which is obviously wrong, you can just plug it back into the equation to see that. But you can also get infinity by deduction and algebra, which I believe is correct.

x=x+1 1=(x+1)/x 1=(x/x)+(1/x) 1=1+(1/x) As x approaches positive or negative infinity, 1=1.

So what's going on here?

submitted by /u/Xavienth
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How does the intelligence of a large wild cat like a lion or tiger compare to that of your run of the mill house cat?

Posted: 10 Aug 2019 08:47 AM PDT

What is the difference between a spandrel and vestigial feature?

Posted: 10 Aug 2019 12:24 AM PDT
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Saturday, August 10, 2019

How should I imagine a Jurassic prairie, in terms of the common plants, without major grasses or flowering plants? What would have been the default "ground cover" for such an environ?

How should I imagine a Jurassic prairie, in terms of the common plants, without major grasses or flowering plants? What would have been the default "ground cover" for such an environ?

How should I imagine a Jurassic prairie, in terms of the common plants, without major grasses or flowering plants? What would have been the default "ground cover" for such an environ?

Posted: 09 Aug 2019 07:25 PM PDT

Are bees the best pollinators? And could other pollinators take their place?

Posted: 09 Aug 2019 05:40 PM PDT

Why are bees held in much higher esteem than other pollinators? Are they the most efficient pollinators? And if so, what gives them the edge over other pollinators? Additionally, if bees dissapeared today would it be possible for plants to be pollinated just as efficiently if an extant species rose up to fill in the bee's "job"?

submitted by /u/DunkeyKunga
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What prevents power from flowing from my electrical appliances containing a battery, back to the grid?

Posted: 10 Aug 2019 05:19 AM PDT

I know electrical power flows from a higher electrical potential point to a lower one, my question is whether this is the only mechanism that stops my laptop's battery from discharging into the grid or if there are some other mechanisms in place?

submitted by /u/elmakabu
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When a rocket is about to take of there is always a gas coming out of the rocket before the lift of, why?

Posted: 10 Aug 2019 04:56 AM PDT

Why do distant lights flicker?

Posted: 10 Aug 2019 05:31 AM PDT

Do penguins have knees and if yes, can they even use them?

Posted: 10 Aug 2019 05:26 AM PDT

So I had this question because I saw that most penguins basically only have their feet visible but nothing of their legs. So if they have legs, do they even have knees in there or like what?

submitted by /u/Nambay
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How do we know the amount of a species in the wild?

Posted: 09 Aug 2019 07:16 PM PDT

I was watching some videos today on nearly extinct wildlife and as I watched I would hear "There are only around X left in the wild". Now, I know that number isn't precise, per say, but I am curious. How do they go about estimating the amount of a species left out in the wild?

submitted by /u/Manic_Writer
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Why doesn’t anybody want to find more stable isotopes of existing elements?

Posted: 09 Aug 2019 11:22 AM PDT

With all the talk about discovering new elements, other elements are just left behind. Take astatine, for example. While it theoretically has a stable isotope, it's still heavier than any isotope discovered or created. It'll surely be easier to add more neutrons to astatine than try to make element 119 or 120. With the many, possibly unique properties of the those near the end of the periodic table, it seems like a no-brainer to try and look into those as well as discovering new ones.

submitted by /u/PixelJack79
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If a floating object displaces an amount of water equal to its weight, then why would a melting iceberg make the sea level rise?

Posted: 10 Aug 2019 02:17 AM PDT

If an iceberg melts, wouldn't the volume of water added to the ocean be equal to the volume of water that was already displaced by the iceberg?

submitted by /u/_ivanthespacebiker
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Are there wildfires in the Amazon?

Posted: 09 Aug 2019 12:02 PM PDT

I was just watching this CNN "Connect The World" report/episode, and they were [showing clips of fly over sections of the Amazon rainforest](

Ignoring the source/wording/topic of that show (I am not intending to argue about the source, you'll get the gist of what I'm asking if it's on mute while you're watching). When I was watching that "fly over the rainforest" part, seeing those images, I was expecting it to look a bit more like the BC forests/rainforest, or California's forests, where there's obvious damage to the forest from wildfires, and new fires each year.

I am specifically trying to understand why the Amazon doesn't appear to be as affected by fire as the California and BC mountains/forests/rainforests.

I tried researching before asking you guys, but all I am able to find is very targeted, specific articles like this one, claiming that Amazon rainforests are earnestly fireproof on their own, but due to human interference they're now catching fire as well.

Specific Questions

  • Is this just because there aren't as many people in the Amazon so it's not as common for it to affect populations, and therefore not reported on as frequently?

  • Are all of the wildfires down the West coast of Canada and the US caused by humans, and due to fewer humans residing in the Amazon it's not as common?

  • Is this because of the types of trees that grow on the different climates being more or less resilient to fire?

Note/context: I hope this post doesn't come off as obtuse or rude somehow. I don't have any ulterior motive in asking this. I just don't have much knowledge about how the Amazon rainforest functions. When autoplay showed me the CNN "Connect The World" clip the images just caught my attention because they don't look anything like the forests I've visited in person throughout both Canada and the US.

I really appreciate if anyone could help explain this for me. Please and thanks in advance!!

submitted by /u/justarandomcommenter
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When a large meteor burns up in the atmosphere and leaves a lingering cloud-like trail in the sky- what’s that trail made of?

Posted: 09 Aug 2019 04:00 PM PDT

Are all solar systems are the product of an earlier star that existed in the same location? What do we know of the star that birthed out solar system, and does it have a name?

Posted: 09 Aug 2019 08:36 AM PDT

What's the difference between valency and oxidation states?

Posted: 09 Aug 2019 08:32 AM PDT

Who gets better fuel mileage? Truck driving 5 kms on flat ground at 60 MPH, or same truck driving up and down hills but end at the exact same elevation, same speed and distance.

Posted: 09 Aug 2019 03:17 PM PDT

In climate science, why is altitude often measured in hPa (pressure) instead of meters?

Posted: 09 Aug 2019 01:31 PM PDT

Why does taking N-Acetyl Cysteine(NAC) before drinking alcohol protect the liver, but taking it after actually exacerbates the damage done by the alcohol?

Posted: 09 Aug 2019 09:07 AM PDT

In reference to this study. When taken 30 minutes before ethanol administration, NAC acts as an anti-oxidant, mostly as a glutathione precursor, and mitigates some of the oxidative damage done to liver cells. However, when administered AFTER ethanol administration, they believe it may behave in a pro-oxidant manner and double down on the damage. What would cause this? Is it likely to be dose-dependent? And if this is the case with ethanol, why is it not the case when massive doses of NAC are administered after acetaminophen overdose? After researching as much as I can on the internet, this one study is the only mention I can find of this negative interaction.

submitted by /u/Richard_Thrust
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What is the elimination half-life of morphine-3-glucuronide and codeine-6-glucuronide in human subjects?

Posted: 09 Aug 2019 12:25 PM PDT

The question says it all.

I have tried to search on google and in research papers but so far haven't been able to find an answer... so what is the elimination half-life of morphine-3-glucuronide and codeine-6-glucuronide in the human body?

Thank you!

submitted by /u/Ell2509
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From a quantum mechanics perspective, why is a lower energy state more stable?

Posted: 09 Aug 2019 12:14 PM PDT

Hi guys,

Thus far my understanding (superficial though) comes from a Q&A from Physics SE in which one user states that 'systems go to lower energy states when they share their energy with some other system' which in-turn has so many degrees of freedom that 'energy is divided into indiscernible small portions.'

submitted by /u/Al-Andalusia
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vào lúc No comments:

Friday, August 9, 2019

Scientists think the Earth had 2 periods of time when it was almost completely covered in ice. They only lasted a few million years. Do we have any way of knowing if Europa or Enceladus might be in similar temporary freezes? Or is theirs a clearly permanent state?

Scientists think the Earth had 2 periods of time when it was almost completely covered in ice. They only lasted a few million years. Do we have any way of knowing if Europa or Enceladus might be in similar temporary freezes? Or is theirs a clearly permanent state?

Scientists think the Earth had 2 periods of time when it was almost completely covered in ice. They only lasted a few million years. Do we have any way of knowing if Europa or Enceladus might be in similar temporary freezes? Or is theirs a clearly permanent state?

Posted: 08 Aug 2019 07:43 PM PDT

How are animal toxicity studies related back to humans when different species find different things toxic?

Posted: 08 Aug 2019 01:46 PM PDT

Let's take raisins for example. If you were testing raisins in dogs, the LD50 would be really low compared to the LD50 in humans.

How do we account for these differences? Are there animals that have consistently had similar toxicities as humans that are used (mice? pigs?)? Are compounds tested in many different species? I know they can be tested on human cell lines, but that doesn't necessarily equate to the whole system.

submitted by /u/chocolatem00se
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Can unborn babies have allergic reactions/do they have allergies?

Posted: 09 Aug 2019 07:24 AM PDT

What are the potential affects? Could it kill the fetus?

submitted by /u/semipreciousmetal
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Why do medicines that work as painkillers typically also reduce fever?

Posted: 08 Aug 2019 07:30 PM PDT

What was the main theory of the extinction of the dinosaurs, pre-discovery of the Chicxulub crater?

Posted: 09 Aug 2019 05:36 AM PDT

Is it possible that small exoplanet, which does not acquire magnetosphere, has an atmosphere?

Posted: 09 Aug 2019 01:02 AM PDT

To my small understanding, the magnetosphere is necessary to have atmosphere because of solar winds which can destroy atmosphere (this happened on Mars right). And we are almost sure that planets exist outside of star systems. So hypothetically, is it possible for such planet to sustain atmosphere without functional magnetosphere outside of star system?

Thanks and please be sympathetic with me. I am no close to astronomy and english (unfortunately).

submitted by /u/Frolda_
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Besides the famous Janus cat, "Frank and Louie," have there been any other publicized cases of diprosopus (not sure of adjective form) animals (those with a duplicated face) surviving into adulthood and ultimately dying for reasons unrelated or mostly unrelated to their condition?

Posted: 09 Aug 2019 02:41 AM PDT

Why does a tropical storm's outflow have an anticyclonic motion?

Posted: 08 Aug 2019 08:38 AM PDT

I recently saw a gif of clouds moving away from a typhoon in a clockwise flow instead of anti-clockwise (northern hemisphere). A quick google search told me that that was cyclone outflow and it happens because 'vorticity is reduced as air is lifted through the storm'. But then why does the spin then reverse? Why does it not seem to be affected by the Coriolis effect? Thank you!

submitted by /u/mistaknomore
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Is immunotherapy effective on brain tumors?

Posted: 08 Aug 2019 08:52 PM PDT

With extensive searches there is little information to find one way or another. Most sites discuss what scientists and medical facilities hope to achieve for patients, but little information about what is currently achievable.

Is immunotherapy a current and effective option for brain tumor patients?

submitted by /u/Ks427236
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For a container with two holes in a liquid exerting a pressure. Is the force of the liquid through each hole the same as the force through the hole of only one hole were there?

Posted: 09 Aug 2019 12:14 AM PDT

If the area of each hole is A, and liquid Pr. Is P, if the force of liquid through one hole P/2A or P/A?

submitted by /u/TakenNameception
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What exactly determines something as a null geodesic, and why do massless particles like photons follow the null geodesic? Also, why does gravity affect the null-geodesic?

Posted: 08 Aug 2019 09:14 PM PDT

From my understanding light travels along the null-geodesic. If it would try to pass an object with high mass (e.g. a black hole), the null geodesic is affected by the gravitational pull, which also causes light to be pulled respectively, which would also slow down time. At the same time, isn't the null-geodesic a "status" where time does not exist because the Minkowski metric is 0?

I think I've got some stuff mixed up, and I'd like to understand it more.

submitted by /u/SG_Nightman
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What does "Earth-analog outgassing rates for surface pressure" mean?

Posted: 08 Aug 2019 12:20 PM PDT

I'm reading this paper:

https://arxiv.org/ftp/arxiv/papers/1907/1907.13215.pdf

page 8, 10 lines down.

submitted by /u/derp_status
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Why don’t the inside of pipes erode away?

Posted: 08 Aug 2019 01:39 PM PDT

I know they act on serotonin receptors like 5-HT1D, but how exactly do triptans abort migraines?

Posted: 08 Aug 2019 02:27 PM PDT

When is the butterfly's sex determined? Is it when it hatches into a caterpillar or when it transforms from a caterpillar to a butterfly inside the pupae? And if the answer is the first option, does the caterpillar have any sorts of genitalia or something that reveals its sex?

Posted: 08 Aug 2019 02:40 AM PDT

How do people predict the paths of forest fires?

Posted: 08 Aug 2019 09:15 AM PDT

I always see the predicted path of a forest fire, but what factors lead to where to fire burns? I know the wind is probably one factor but what else determines the path of the fire?

submitted by /u/foxtrot888
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What do we mean when we refer to the age of the universe?

Posted: 08 Aug 2019 02:21 AM PDT

If gravitational time dilation means that the speed of a clock is affected by the mass in the local area of space, then different physical regions of the universe will have different times elapsed since the big bang. The age of the space inhabited by the solar system will be different to that in the intergalactic vacuum. Wouldn't the vacuum observer come up with a different age?

What exactly is it that is 13.772 billion years old?

submitted by /u/NeuralParity
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