When did "sleeping" evolve? What are the most primitive organisms that we know of that sleep? |
- When did "sleeping" evolve? What are the most primitive organisms that we know of that sleep?
- Why do we have trouble instantly counting larger groups of objects (say, 7+), while we can instantly identify the number in smaller groups?
- Do dreams happen in real-time?
- Is the Higgs field constant throughout the entire universe? Could any fluctuations (Higgs waves) cause objects to become more or less massive?
- Does fusion occur within a black hole?
- Will keeping jugs of water in my refrigerator save energy?
- Why don't heart muscles seemingly get tired?
- Why aren't planets tidally locked to the sun, the way moons are tidally locked to their planet?
- Why is FADH formed in the krebs cycle, instead of more NADH?
- If EM waves are propagated by photons, does that mean that gravitational waves are propagated by gravitons?
- Is there such a thing as a second order integral? I know you can take multiple derivatives. But does it go the other way around and if so, what do they do/mean?
- Chem Eng undergrad here. I very often see process flow diagrams just split the streams, in order to divide the material flow. What is the working mechanism in real life that facilitates this? (Examples in text)
- How come giving someone with type A blood a transfusion of type O blood is safe, but giving type A blood to a patient with type O blood could kill them?
- Can people who have type 1 diabetes mellitus also develop type 2 as a result of an unhealthy lifestyle? If so, what are their treatment options?
- Does the sense of balance and orientation require both inner ears to function properly or is there redundancy?
- Does optical reflectance of a substance depends on any factors?
- Would the discovery of the graviton (or something similar) force us to get rid of the geometric model of gravity via space time curvature? Or would both pieces be needed for a universal theory?
- Can we still see depth when covering one eye?
- What applications does CRISPR/Cas9 have with respect to cord blood?
- How do forest fires start 'naturally'?
| When did "sleeping" evolve? What are the most primitive organisms that we know of that sleep? Posted: 22 Mar 2016 10:35 AM PDT Was reading an askreddit thread about "weird and common things" and sleeping is brought up. It still seems so strange to me that organisms evolved the need for sleep. For one thing it makes us completely vulnerable to predators. Do we have any idea when this habit first appeared in the evolutionary timeline? [link] [comments]  |
| Posted: 22 Mar 2016 09:40 PM PDT |
| Do dreams happen in real-time? Posted: 22 Mar 2016 10:11 AM PDT If in my dream, I walk for 30 seconds, does 30 seconds actually pass in real life? Or is there no correlation? Hopefully this makes sense! I'll clarify if needed [link] [comments]  |
| Posted: 22 Mar 2016 06:34 PM PDT |
| Does fusion occur within a black hole? Posted: 22 Mar 2016 02:36 PM PDT It seems like a black hole would fuse the matter it takes in into a super huge single nucleus, no? Or am I completely off here? [link] [comments]  |
| Will keeping jugs of water in my refrigerator save energy? Posted: 22 Mar 2016 06:14 PM PDT I live alone for the most part. My fridge is maybe half full at most. Would filling the empty space with cold water from my tap in jugs save energy? Most answers I've found don't have enough information for me to accept as answers. They assume that you're using only one or two jugs or using small bottles to fill gaps. I'm talking 4 or 5 maybe 6 gallon jugs. Also, they assume cooling from room temperature but the water from the tap is already really cold. So let's assume the fridge is 12 gallons and it's half filled with food the other half is gallons of water. The water is 50° F before it goes in the fridge. Would this save a significant amount of energy over a month or year? I don't how how big fridge is. I rent, its not mine. I don't pay utilities, so I don't really care what the cost is just energy savings. After writing this, would this be a better question for /r/theydidthemath ? [link] [comments]  |
| Why don't heart muscles seemingly get tired? Posted: 22 Mar 2016 11:22 PM PDT Is the composition different from our other muscles that makes it unique, or does being in the direct blood flow replenishes it somehow? [link] [comments]  |
| Why aren't planets tidally locked to the sun, the way moons are tidally locked to their planet? Posted: 22 Mar 2016 03:35 PM PDT Tidal locking aka 'synchronous rotation', is when bodies have the same rotation and revolution rate compared to their partner. The result is the same side faces the planet at all times (picture the Earth and its moon). Nearly all of the natural satellites in our solar system are tidally locked to their respective planet. None of the planets are. Why is this? [link] [comments]  |
| Why is FADH formed in the krebs cycle, instead of more NADH? Posted: 22 Mar 2016 10:04 AM PDT So, after learning about the stages of cellular respiration, I was wondering about the uses of FADH. it makes less ATP per molecule, so why is it made during the cycle instead of more NADH? If applicable, what applications does it have in comparison? [link] [comments]  |
| Posted: 23 Mar 2016 04:28 AM PDT I was wondering why we not heard anything about the graviton with the recent discovery of gravitational waves? Doesn't wave-particle duality implicate that we have found this final force carrier? Is there any way that gravitational waves can help us find the graviton? Thanks for your help. [link] [comments]  |
| Posted: 22 Mar 2016 01:13 PM PDT |
| Posted: 22 Mar 2016 07:54 AM PDT Sulfuric acid https://files.catbox.moe/flh4x1.png Air https://files.catbox.moe/f6qplb.png I'm just guessing that it's a tank/drum/container with valves that dictate how much the flowrate passes though, and the ratio of the split is controlled by the area of the orifice. But that's just a guess. [link] [comments]  |
| Posted: 22 Mar 2016 12:17 PM PDT |
| Posted: 22 Mar 2016 06:01 AM PDT I am aware that types 1 and 2 diabetes have very different causes. Type 1 is caused by autoimmune destruction of pancreatic islets and is usually treated with regular injections of insulin, and type 2 is characterised by resistance to insulin's action. If a person with type 1 diabetes were to also develop type 2 due to their lifestyle, would there be any way to treat them? [link] [comments]  |
| Posted: 23 Mar 2016 12:59 AM PDT I do understand inner ear damage in one ear can cause balance problems. But if the vestibular systems are mirrored on each side of the head, shouldn't the sense of balance remain unimpaired if only one is damaged? Or are the sensory inputs from both sides required to form the sense of balance and orientation? [link] [comments]  |
| Does optical reflectance of a substance depends on any factors? Posted: 22 Mar 2016 12:19 PM PDT By factors, I mean not the angle of incident, wavelength, amplitude etc., but the temperature of the substance, the current applied through it etc. [link] [comments]  |
| Posted: 22 Mar 2016 09:23 AM PDT A few things I'd like to clarify about my question: 1: I recognize, that no matter what, General relativity will still be useful in certain applications and will likely never be thrown away entirely. (Just like how classical mechanics is still widely used). 2: to refine my question: I studied mathematical physics for 2 years before switching to engineering, and I only took one course in relativity and one course in QM, so forgive me if there are gaps in my knowledge. But from what I understand, relativity does not require a force particle for gravity, and instead, gravity is the byproduct of spacetime curvature. This is in clear contrast to QM which (again, from my understanding) requires the existence of a force particle (often times called the "graviton"). So I guess my question is, what do most physicists currently believe the solution will "look like"? Do they believe that a graviton exists? Do they believe that gravitons DON'T exist and space time curvature causes gravity? Or do they believe some combination of space time curving and the existence of a graviton existing in a curved space time causes gravity? I know this is a VERY odd question, and I probably don't have the knowledge to properly ask it... Any help as to finding an answer OR an explanation as to why this question unanswerable would be greatly appreciated! I'd love to learn more! [link] [comments]  |
| Can we still see depth when covering one eye? Posted: 22 Mar 2016 10:03 AM PDT |
| What applications does CRISPR/Cas9 have with respect to cord blood? Posted: 22 Mar 2016 09:59 AM PDT Cord blood is harvested and stored just after birth from the umbilical cord, and is enriched in hematopoietic stem cells (HSCs). Lots of studies show that the peanut allergy (an immune response) can be transferred via peripheral blood (which contains HSCs), so that leads me to believe other immune responses could too. Could CRISPR/Cas9 applied to cord blood in vitro and subsequent injection of that blood be used to treat immune disorders where the cause is known and genetically editable? What disorders are there that fit that category? [link] [comments]  |
| How do forest fires start 'naturally'? Posted: 22 Mar 2016 04:57 PM PDT I know that forest fires are a natural part of the lifecycle of an arboreal environment, but how do they start? Most lightening occurs during a rainstorm which would reduce the chance of starting a large fire. Are there other causes? [link] [comments]  |
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