| Has there been a higher peak than Mt. Everest on Earth throughout its history? Posted: 20 Dec 2019 05:26 AM PST Im not thinking a higher mountain in total like the Mauna Kea, but rather from sea level upwards. submitted by /u/dsdrft [link] [comments] |
| If it takes less energy to boil water at higher altitudes, are there any variable that change the freezing point of water? Posted: 19 Dec 2019 07:52 AM PST For example I've been told that water doesn't freeze at the bottom of the ocean because the pressure keeps it from expanding. Is this true? submitted by /u/SlitherySnekkySnek [link] [comments] |
| When does the brain actually develop enough to do math? Posted: 19 Dec 2019 06:42 AM PST A kid I babysit can solve 10+4 but not 4+10. I know kids memorize things really well, so it made me wonder if she's actually just memorized all of the sums she knows. Lo and behold, she can't solve the reverse order of any math problems her teacher taught her. When can the brain really start to solve basic math problems using logic and not memorization? And to extend on that - how do we accurately find this out if the kids might have just memorized the answers? And to dump a third, and kind of hypothetical question onto the pile - why bother teaching and testing math skills before their brains are actually able to do math? Edit: thank you for the incredibly helpful answers! I just wanted to assure you I'm in no way trying to change her approach to doing math, or anything like that. I've been in varying levels of childcare for more than ten years and this developmental stage has always been fascinating to me :) I feel like I can actually use some of the information here to more effectively do my job, so thank you! submitted by /u/Cats_Waffles [link] [comments] |
| Why charges in uniform motion can't be the sources of electromagnetic waves? Posted: 20 Dec 2019 02:52 AM PST Charges in uniform motion produce magnetic fields. But they produce Electric fields too, right? If they do, then why they can't be the source of EM waves? If they don't, why don't they produce Electric field while moving in uniform motion? submitted by /u/m_vishuu [link] [comments] |
| Whats the mechanism for sleep-deprivation induced psychosis? Posted: 19 Dec 2019 06:44 PM PST |
| Is there a 2D lattice allotrope of silver or copper? Posted: 19 Dec 2019 10:23 PM PST I've known about graphene for a long time, as I'm sure many of you have, but I just recently thought about a similar layout with Ag or Cu. I looked it up and only found molecules consisting of multiple elements. Because they are the best conductive elements we know of (silver is #1, but copper is a close second), I'm just curious. Also, if they have the 2D lattice, do you think they could create nanotubes as well? submitted by /u/19Jacoby98 [link] [comments] |
| At what age did Neanderthals reproduce? Posted: 19 Dec 2019 05:14 PM PST I've been trying to find the answer to this for quite some time now, posing my question to google and some science websites in both "scientific" language and "more blunt" language (I wrote questions today I never thought I'd ever write, so) but I couldn't find the answer anywhere. So my last resort is here. So, as the title asks: At what age did Neanderthals reproduce? Did they start when they were 8? 12? 18? And I'm not asking when they COULD (like, at what age they physically became capable to do so) but at what age they DID. e.g. Today a lot of 12yo girls have had their periods, and thus could have children, but THEY DON'T. So, yeah. That's about it for my question. Also, I hope paleontology is the correct flair for this one, but other possibilities were archeology and biology. submitted by /u/JonasDFB [link] [comments] |
| How do we know how ancient and dead languages sounds like? Posted: 19 Dec 2019 07:48 AM PST |
| Do Black Holes Precess as They Spin? Posted: 19 Dec 2019 09:31 AM PST Do black holes precess as they spin? Can the direction of their rotational axis change over time? I assume their angular momentum is the sum of the angular momentum of everything they have consumed, so if a black hole eats something new, its axis will change directions accordingly. But for a black hole with no external forces on it, is it possible to precess? If it is possible, does this mean that we could potentially see pulsing quasars? submitted by /u/IndependenceDayOnVHS [link] [comments] |
| How much rock does a mountain produce or shed per year or second? And about how fast does a river break rock? Posted: 19 Dec 2019 11:38 PM PST |
| How fast do plasma particles move specifically? Posted: 20 Dec 2019 01:42 AM PST |
| Why do we mainly use bases for cleaning? Posted: 19 Dec 2019 12:47 PM PST |
| What is the process of your body getting acclimated to a new climate and does this length of time vary for certain people? Posted: 19 Dec 2019 07:18 AM PST I remember living in Texas for about 4 months. Midway through, I felt acclimated to the climate to the point where a long sleeve shirt and pants were bearable for me in the summer. What is this acclimation process, as in, how does it work in our bodies? Is 2-3 months a normal acclimation period? Does this period vary between certain people or groups of people? Do other animals experience a similar process? Thanks in advance! submitted by /u/DrShadowSML [link] [comments] |
| Can memories or skills be created "outside" of the brain? Posted: 19 Dec 2019 04:00 AM PST Can someone develop memory/skill outside of the brain? Nerve system is pretty complex, is there a possibility that there will be some neuron connections let's say in a person's heart or spinal cord? Are stories about people that never played an instrument or could speak a language but are able to after transplantation of some organ real? Obligatory sorry for my english submitted by /u/jakoboo [link] [comments] |
| Aside from loss of bone density what other systems of the body are affected by zero-g? Posted: 19 Dec 2019 04:26 AM PST For example, would the cardiovascular system become weaker, with not having to fight against Earth's gravity when pumping blood around the body? submitted by /u/Veldron [link] [comments] |
| Difference between pseudo-obstruction and paralytic ileus? Posted: 19 Dec 2019 05:10 AM PST Hi guys, Not sure whether this is the right place to post this, but I'm a medical student currently doing my general surgery posting and I'm really confused about the difference between paralytic ileus and pseudo-obstruction. Both seem to be when there is no gut motility in the absence of any anatomical lesion, but somehow there seems to be a distinction between them (paralytic ileus is a differential for pseudo obstruction and vice versa). I've tried googling this but to no avail Could someone explain this to me please? Thanks so much! submitted by /u/kyzzz_ [link] [comments] |
| What actually happens when a Satellite 'burns up' in the atmosphere? Posted: 19 Dec 2019 05:39 AM PST So I've seen mention that some satellites are designed to burn up harmless after their "life span" is over... However I'm pretty sure the metals, plastics, and other components aren't literally annihilated. What actually happens to all of the matter that made up the satellite? Will all of it eventually rain down onto the surface? I could image some of the plastic components being light enough that they slough into the upper atmosphere and eventually into space. Are there materials that could still be harmful even at super low concentrations? submitted by /u/aslum [link] [comments] |
| Would you be able to live without an amygdala? Posted: 19 Dec 2019 02:16 AM PST |
| Will a non ferrous metal passing perpendicularly though an electric field feel any kind of resistance (magnetic maybe)? Posted: 18 Dec 2019 11:26 PM PST So I think I have my physics mixed up and I just want to check, but I know if I pass a magnetic field through a wire perpendicularly I can induce a current (eg. Shake charge flashlights). But if I have a non ferrous piece of metal (for example a bullet) flying at great velocity though an electric field perpendicularly (created by a high current though a loop) would it's trajectory be impacted in any way? I feel like my physics is all messed up, please help! submitted by /u/Redalpha2 [link] [comments] |
| How does the process of reducing Indigo to Leuco-Indigo work? Posted: 19 Dec 2019 07:09 AM PST Recently in our chemistry class we have learned about all the different types of dyes, including vat dyes such as indigo. For a piece of cloth to be colored with indigo, the dye is added to a mixture of water, sodium hydroxide and sodium dithionite. From what I know the sodium dithionite serves as the reducing agent (for producing the leuco form of indigo). 1. Why is sodium hydroxide needed? How exactly does sodium dithionite reduce the indigo dye? Can another reducing agent be used in this reaction? Comparing the molecular structure of indigo and leuco-indigo, the only difference I could see is the addition of 1 hydrogen ion to the 2 oxygen atoms(each). Where do the hydrogen ions come from? submitted by /u/BroProAl3x [link] [comments] |
| Does sound travel farther/more quickly in cold air then it does in warm or humid air? Posted: 18 Dec 2019 06:08 PM PST I've noticed that it sounds different outside when it gets cold, like I can hear more ambient noise, so I was wondering if this is just in my head or if this is actually something that occurs. submitted by /u/kdt912 [link] [comments] |
| Is there different in severity of Asian Glow? Posted: 18 Dec 2019 06:45 PM PST My friend is full Asian and experience very severe Asian flush when consuming alcohol. I am half Asian and while I experience Asian glow, I don't experience nearly the severity that he does. I know this is because of a deficiency of an enzyme, but do I have less of a deficiency because I'm not full? Or is it just a 'you have the enzyme or you don't' type situation. Thanks submitted by /u/Kazukster [link] [comments] |
