How do our hairs know when to stop growing? |
- How do our hairs know when to stop growing?
- What is the difference between each one of the happiness chemicals (Dopamine, Endorphins, Serotonin, Oxytocin)?
- Could you beat a magnetized piece of iron until it loses it's magnetism?
- Why does space-x use a suicide burn for its reuseable boosters rather than parachutes?
- Why do pixels use RGB colors and not the primary colors RBY?
- Are Volcanologist flocking to Hawaii at the minute, or is there not much to learn from being there in person?
- How do scientists measure total insect populations?
- Is there any difference in later life between people born by C sections, or Natural births?
- Can someone help explain how the 1883 eruption of Krakatoa was heard 3000 miles away? This can't be true. How would that even be possible
- Why is the ozone hole over Antarctica if all of the emissions that are causing it are from everywhere else?
- What is the physiological basis of increasing stamina?
- Have there been periods of greater or lesser volcanic activity on earth, and if so, what causes this variation?
- How can a person's own stem cells be used on them to treat a genetic disease when the defective gene is present in the extracted stem cells too?
- Are invasive species ever beneficial to their new environment(s)?
- Can a single mosquito carry multiple viruses at the same time?
- What determines one’s blood type?
- What are the constant regular magnetic pulses on this Schumann resonance magnetogram?
- Do volcanic eruptions, such as the one currently happening in Hawaii, have an effect on global temperature?
- Can someone explain the significance of the Fibonacci sequence and how rabbit breeding pairs were used to identify this sequence?
- What's the proportion of heat our bodies dissipate through thermal radiation?
- Do muscles wear mechanically?
| How do our hairs know when to stop growing? Posted: 18 May 2018 05:06 AM PDT How come my eyebrows for example stop at a certain length, yet if I cut them in half they'll grow back to that same size? How do they know their own length? [link] [comments]  |
| Posted: 18 May 2018 03:18 AM PDT I am scouring the internet for answers (currently this Quora answer: https://www.quora.com/Whats-the-difference-between-dopamine-serotonin-oxytocin-and-endorphins) but I still fail to understand the difference between each happiness chemical. Dopamine makes us feel good, but Endorphins regulate our well being (isnt that the same?). Also every chemical is being described as "responsible for happiness". And not only that, I have read that since we have thousands of different circuits comprising of millions of synapses, the same chemical may have totally different effects in each circuit, which just adds more confusion. Do I need a degree in neuroscience to understand this stuff? [link] [comments]  |
| Could you beat a magnetized piece of iron until it loses it's magnetism? Posted: 17 May 2018 07:21 PM PDT Is a magnetic field subject to shock-induced interference? If I rubbed an iron rod with a magnet and magnetized it, could I then pound that piece of iron until it loses it's magnetism? [link] [comments]  |
| Why does space-x use a suicide burn for its reuseable boosters rather than parachutes? Posted: 17 May 2018 06:02 PM PDT |
| Why do pixels use RGB colors and not the primary colors RBY? Posted: 17 May 2018 10:28 PM PDT This thread is not to ask the same question that has been asked before, but to clarify some things that I felt were misleading with previous answers. I was thinking about why our screens use red/green/blue to display colors, instead of the (classic)primary colors red/blue/yellow(or their complementaries). I found some old threads full of (what appears to be) people explaining scientific concepts without addressing the WHY of the question, or saying silly things like "your teachers lied", as if the objective concept of primary colors is wrong and the science of perceiving color is above the science of the light frequency spectrum. Now, the problem with RGB vs (classic RBY)primary colors is that the primary colors are spaced out equally according to frequency whereas in RGB green is closer to blue than red. I saw a lot of answers bringing up the difference between additive and subtractive colors, but not really much explanation behind why we'd use RGB in particular. The one explanation that made sense to me was that the human eye perceives green easier than yellow(because it uses RGB rods), thus we use a slightly distorted version of primary colors to easily display all colors. However is this not also one of the reasons we use the slightly offset subtractive color scheme of cyan/yellow/magenta? If so, the frequent answer "because RGB is additive and screens emit light" is a bit misleading. Also, nobody seemed to mention that the "green" in rgb is not pure green, but closer to yellow. Is my analysis correct? Am I missing something? Edit: Got some great answers and need to sleep on it now. Thanks! [link] [comments]  |
| Posted: 18 May 2018 02:31 AM PDT I would think it would be an amazing time to be a Volcanologist with such an opportunity. Just an odd thought that hit me as I was watching the news, the idea of people evacuating and being scared while scientists might be eagerly arriving. [link] [comments]  |
| How do scientists measure total insect populations? Posted: 18 May 2018 05:13 AM PDT Just read that the total mass of flying insects in German nature reserves has decreased by more than 75 percent since 1989. How did they measure the total mass of insects in 1989 and how do they do it now? [link] [comments]  |
| Is there any difference in later life between people born by C sections, or Natural births? Posted: 17 May 2018 02:39 PM PDT For example do people born naturally live longer, or have less chance of disability? [link] [comments]  |
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| Posted: 18 May 2018 05:59 AM PDT |
| What is the physiological basis of increasing stamina? Posted: 17 May 2018 05:05 PM PDT I.e., why does running get easier over time? I get that relevant muscles will get toned etc, but what else is involved? [link] [comments]  |
| Posted: 17 May 2018 01:56 PM PDT |
| Posted: 17 May 2018 01:55 PM PDT Will a baby whose umbilical cord blood stem cells have been banked be benefited in such a case ? [link] [comments]  |
| Are invasive species ever beneficial to their new environment(s)? Posted: 17 May 2018 02:23 PM PDT EDIT: I'm not condoning the act of releasing a species into a new ecosystem, as I'm well aware of the dangers involved. I'm just wondering if the opposite can be true as well. [link] [comments]  |
| Can a single mosquito carry multiple viruses at the same time? Posted: 17 May 2018 10:56 AM PDT For instance, can a single mosquito have a malaria virus and west nile at the same time and be able to transfer them both to a human in a single bite? [link] [comments]  |
| What determines one’s blood type? Posted: 17 May 2018 10:44 AM PDT |
| What are the constant regular magnetic pulses on this Schumann resonance magnetogram? Posted: 17 May 2018 08:26 PM PDT http://sosrff.tsu.ru/new/shm.jpg There seem to be around 4 to 5 per hour very regularly. Most extend from around 2 Hz to around 28 Hz. I don't remember exactly when they started, but it seems like it's been more than a week now. [link] [comments]  |
| Posted: 17 May 2018 10:13 AM PDT With the recent ongoing eruption of Kilauea in Hawaii, and the subsequent plume of ash being tossed into the atmosphere from it's summit, will such an event impact the global climate in any significant way? If so, in what manner? Thanks! [link] [comments]  |
| Posted: 17 May 2018 09:49 AM PDT I read a fiction book recently, and it discussed the Fibonacci sequence. As a non-mathematician, I am only aware that it is a sequence that adds the previous two numbers to come up with the next number in the sequence:
The book tried to explain it as a way to determine the number of breeding pairs of rabbits over the course of the year. It was said that the number of breeding pairs at the end of the year was 144, but that the numbers in the sequence were the number at any point during the year, or something. I just cannot picture in my head how this sequence was derived using breeding pairs of rabbits. Also, is there a mathematical significance to this sequence, or is it just something neat that was observed? I'm not asking for an overly simplistic explanation -- I was hoping for something a bit more technical than that -- but for something that someone with a BS in a technical field could understand, though I'm sure that I will feel like an idiot when someone explains it to me and I see where my brain couldn't get past. :) [link] [comments]  |
| What's the proportion of heat our bodies dissipate through thermal radiation? Posted: 17 May 2018 10:17 AM PDT I know it depends of the conditions (humidity, wind, temperatures etc) but I mostly want an order of magnitude. We had a debate with a friend who told me that our clothing colors didn't matter for heat dissipation because only a really small fraction of heat is dissipated through thermal radiation, and most of it is conduction. I was certain that radiation was playing an enormous role, but I can't find decent sources on that. How can I figure out those numbers? [link] [comments]  |
| Posted: 17 May 2018 01:59 PM PDT When muscles move they have moving parts inside them (actin and myosin). Do these parts deteriorate because of use? Do muscles need to be constantly regenerated? [link] [comments]  |
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