Why do ice cubes crack when liquid is poured over them? |
- Why do ice cubes crack when liquid is poured over them?
- Is there anything special about the visible spectrum that would have caused organisms to evolve to see it?
- Why does (what role) HIV infected children have higher prevalence of staphylococcus aureus than for other staphylococcus species?
- Why does volcanic ash stay up for so long? Isn’t it relatively heavy?
- Why does the first ionization energy go down from Nitrogen to Oxygen?
- If the neutron does not possess any charge, how coud exists an antineutron?
- Why can't we create a perfectly straight beam of light with optics? What makes lasers so special?
- If a pregnant woman does not consume enough calcium during the babies development. Does her body choose to pull calcium from her own bones, or underdeveloped the bones of the child?
- Why are Copper(ii) compounds such as copper acetaf, bad for the Environment/people try to limit its exposure to the environment?
- What would a CIE 1931 chromaticity diagram look like if it's normalized based on MacAdam ellipse?
- Does our native language effect the tone/ pitch of our voice?
- When a chemical "binds to my receptors" what is actually happening?
- Why is the CMB cold spot more significant than other cold spots?
- Why are there moving shadows on the floor in front of my space heater?
- How is foreign DNA extracted from exhumed bodies?
- Is there any liquid more thin then water?
- In the 18th century, astronomers went around the globe to observe the transit of Venus knowing that if they compare their measurements, they could figure out how far the sun is. How does this work?
- Does operating temperature actually affect a electronic device's performance?
- Does Earth have Cryovolcanoes? If not, why?
- What did the early (Vostok) cosmonauts carry with them when they returned to Earth?
| Why do ice cubes crack when liquid is poured over them? Posted: 12 May 2018 03:56 AM PDT |
| Posted: 12 May 2018 05:38 AM PDT I hope that makes sense. I'm wondering if there is a known or possible reason that visible light is...well, visible to organisms and not other parts of the electromagnetic spectrum, or if the first organisms to evolve sight just happened to see in the visible wavelengths and it just perpetuated. Not sure if this belonged in biology or physics but I guessed biology edit: I guessed wrong, it's more of a physics thing according to answers so far so I changed the flair for those who come after [link] [comments]  |
| Posted: 12 May 2018 05:39 AM PDT Almost all studies on prevalence of staphylococcus among HIV children indicate higher prevalence for staphylococcus aureus than for other staphylococcus species. Why is this the case? What role does HIV infection play to contribute to this? [link] [comments]  |
| Why does volcanic ash stay up for so long? Isn’t it relatively heavy? Posted: 12 May 2018 02:19 AM PDT |
| Why does the first ionization energy go down from Nitrogen to Oxygen? Posted: 12 May 2018 03:47 AM PDT |
| If the neutron does not possess any charge, how coud exists an antineutron? Posted: 12 May 2018 03:20 AM PDT I'm not physicist, but the intuitive concept of antimater that I have is that an antiparticle is just the same as the particle but with the oposite charge. Then, how can an antineutron exists and be detected? [link] [comments]  |
| Why can't we create a perfectly straight beam of light with optics? What makes lasers so special? Posted: 12 May 2018 06:41 AM PDT Just looking at the inside of camera lenses, it seems we know optics well enough to control light with a pretty high degree of precision. So, why is it that I've never seen light focused into a perfectly straight beam via glass lenses or mirrors before, and instead lasers beams have to be generated through special laser sources? It seems like with our understanding of optics, it should be decently trivial to focus light onto a tiny spot then use a lense at that spot to straighten the beam out. Is there some inherent property with regular light that stops this from happening? Edit: just to clarify, I understand that the waves on a laser beam are temporally and spatially coherent. I'd just like to know why it is that a beam of light that isn't coherent seemingly can't hold a straight beam. [link] [comments]  |
| Posted: 11 May 2018 08:34 AM PDT Is there a sort of priority for all of the babies development? Is the mother's own body a priority, or the childs? Mostly curious about the bones. [link] [comments]  |
| Posted: 12 May 2018 12:39 AM PDT |
| What would a CIE 1931 chromaticity diagram look like if it's normalized based on MacAdam ellipse? Posted: 12 May 2018 03:39 AM PDT Here is a standard CIE 1931 chromaticity diagram with MacAdam ellipse: https://en.wikipedia.org/wiki/Color_difference#/media/File:CIExy1931_MacAdam.png You can see that the ellipses are not identical, with different shapes and sizes. That means the diagram is not isotropic on the basis of human perception. What if we modified the shape of the diagram, so that the MacAdam ellipses all become perfect circles with identical sizes. What would the diagram look like then? [link] [comments]  |
| Does our native language effect the tone/ pitch of our voice? Posted: 11 May 2018 09:29 AM PDT I feel like I've had this preconceived notion that people with different native languages tend to have different pitched voices than others, as a trend. Like native German speakers have a deeper voice than native Italian speakers. I'm not sure this is even true or not, but if it is, what causes it? Just the language itself and the way our mouth forms the different sounds needed to speak that language? [link] [comments]  |
| When a chemical "binds to my receptors" what is actually happening? Posted: 11 May 2018 10:24 AM PDT I have a liquid on me which is an irritant. My arms feel like they are burning/on fire, and wiki says the compound binds to the receptors which are responsible for the regulation of skin temperature, hence i assume, making the skin hot like its on fire. A few hours later im fine, until I wash, then it gets re-activated, and i'm in the same pain as earlier. What is actually happening. Is the chemical compound sticking to cells and transforming them or something, and how does this even work? [link] [comments]  |
| Why is the CMB cold spot more significant than other cold spots? Posted: 11 May 2018 03:57 PM PDT Looking at images of the CMB, I can see many cold regions of the universe. Some of them even appear larger than the one we know as "the cold spot". Are the colors visually misleading of the numbers they represent? [link] [comments]  |
| Why are there moving shadows on the floor in front of my space heater? Posted: 11 May 2018 04:36 PM PDT Looking at the electric heater from above, there are moving shadows in front of it. The lighting comes from above. There is no smoke, so does the heat move, or bend, the light from above to concentrate it in some areas and remove it from others? Or, is it slowing the light down in some areas, something I'm pretty sure is impossible? [link] [comments]  |
| How is foreign DNA extracted from exhumed bodies? Posted: 11 May 2018 07:19 PM PDT I just read a thread where the killer was found on DNA evidence after the victim's body was exhumed over 20 years later. How is foreign DNA, such as semen, able to survive within a rotting corpse for over 20 years and how is foreign DNA isolated and tested in that condition? [link] [comments]  |
| Is there any liquid more thin then water? Posted: 11 May 2018 12:00 PM PDT |
| Posted: 11 May 2018 08:21 AM PDT |
| Does operating temperature actually affect a electronic device's performance? Posted: 11 May 2018 04:10 PM PDT Efficiency/reliability aside, does the temperature of a circuit make a meaningful impact? For example, would cooler processors work faster than hot ones? (Or vice versa?) Would this vary depending on the component? [link] [comments]  |
| Does Earth have Cryovolcanoes? If not, why? Posted: 11 May 2018 11:30 AM PDT Cryovolcanoes have been found on Enceladus, and there's evidence for them on many other moons like Titan and Triton. They're apparently pretty common in the solar system, and probably elsewhere. Does Earth have any cryovolcanoes? We have geysers, but I'm not sure if these are the same thing since they have a different geological mechanism, and we don't call Earth's geysers "cryovolcanoes". [link] [comments]  |
| What did the early (Vostok) cosmonauts carry with them when they returned to Earth? Posted: 11 May 2018 10:09 AM PDT There's all these online links with survival kits that cosmonauts carried after 1968 (the NAZ-3 survival kit), and the awesome TP-82 after 1982 for protection against wolves and bears in the wilderness, but what did the early Vostok cosmonauts (Gagarin, Titov etc) who landed without their capsule carry with them? In particular in terms of weapons, or any kind of survival kit for when they returned to Earth? Did they typically land very far away from their capsule? Did the cosmonauts just wait for help or go to find people? How did the rescue teams find them? And how long did it usually take rescue teams to find them? http://theappendix.net/posts/2013/11/the-cosmonauts-survival-kit [link] [comments]  |
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