When a nuclear device detonates, the shockwave trends to clear overhead clouds, exposing the sky above. If it was raining, does that mean a nuclear device would stop the rain? |
- When a nuclear device detonates, the shockwave trends to clear overhead clouds, exposing the sky above. If it was raining, does that mean a nuclear device would stop the rain?
- Is it possible to see the American flag on the moon via telescope?
- Do gamma rays continue on down in size of wavelength to the Planck length or do they stop at some point, and if so, why?
- Why is the "philia" suffix being used increasingly by academics to denote sexual, or "eros," love, when the Greek roots are clear in their respective differences of meaning?
- What is the rate of formation for Uranium 235 in relation to Uranium 238 and how do we know?
- Do photons absorb from, or lose energy to, other particles they hit? eg. If you heat a room, does that affect the light in the room?
- How are some bacteria able to survive in the upper troposphere?
- Would it be (theoretically) possible to use the heat in the air to generate electricity effectively enough that it would cool the air significantly?
- At what point do foreign words from one language become officially adopted into another language?
- Why don't wireless chargers interfere with sensitive electronics like processors, sensors, and radios?
- What causes the irregularities in the shape of the nuclear explosions in the recently declassified nuclear test videos?
- What is known about the general impact of climate (specifically average temperatures) on human health? Is it physically healthier to live in a hot place?
- When was the equation of gravity first formulated?
- Why do we get stuffy/runny noses when we cry?
- Will all the Lithium-ion batteries we keep in our attics ignite eventually?
- Would the electromagnetic field diverge into its component fields at a low enough temperature or some conditions?
- Why do particles that seem to be on the surface of the objective lens of a microscope come into focus when the stage is lowered far below the working distance?
- Why are some colours easier to see on a black background than a white, eg yellow?
- In special and general relativity, if the "light cone" visualization shows that the past light cone behaves like the future light cone in reverse, how is there light before it was lit at event E?
- Is there a term in evolutionary biology for the opposite of 'koinophilia', where mate selection favors rare or distinctive rather than common phenotypes?
- Is the irregular shape of the periodic table caused by imperfect classification or just because that's how the universe is?
| Posted: 18 Mar 2017 05:23 AM PDT |
| Is it possible to see the American flag on the moon via telescope? Posted: 18 Mar 2017 05:53 AM PDT |
| Posted: 18 Mar 2017 06:26 AM PDT Just trying to wrap my grape around the static nature of the speed of light and it's implications. Has it been postulated or shown, at some point, that electromagnetism and all things that propagate it exist on an, as yet not perceived dimension like the connection between matter and antimatter? [link] [comments]  |
| Posted: 17 Mar 2017 05:25 PM PDT Does this mean that bibliophiles want to have sex with books, or audiophiles have orgasms listening to music? Doesn't the injudicious use of the suffix to denote sexual attraction in certain terms (paedophile, androphile, gynephile, et al.) lead to confusion and difficulty educating others? Shouldn't any "philia" that is defined as sexual in nature be renamed with the "-erotic" suffix, since the Greek roots are defined precisely? [link] [comments]  |
| What is the rate of formation for Uranium 235 in relation to Uranium 238 and how do we know? Posted: 17 Mar 2017 02:32 PM PDT In supernovae, where Uranium 235 and Uranium 238 are formed, how much Uranium 238 is formed in relation to Uranium 235? And More importantly, how do we know why this is the case? As far as I know: When working out the age of the earth you have to know what the rate of formation are for the different nuclear isotopes so that you can use their different rate of decay to calculate the age of the earth. [link] [comments]  |
| Posted: 17 Mar 2017 11:04 PM PDT |
| How are some bacteria able to survive in the upper troposphere? Posted: 17 Mar 2017 01:48 PM PDT I read in this article that some bacteria can survive for weeks at an altitude of about 10 km. How can they withstand the low pressure and cold for extended periods of time? And how are they able to quickly readjust to sea level conditions once they land? [link] [comments]  |
| Posted: 17 Mar 2017 02:15 PM PDT The reason I'm asking is because if it was possible you could create an air conditioner that would generate electricity. [link] [comments]  |
| At what point do foreign words from one language become officially adopted into another language? Posted: 17 Mar 2017 01:29 PM PDT It's very common for languages to adopt words from other languages, but at what point does it become official? For example, the German word schadenfreude, is used so much in English now, at what point would the English language officially adopt it as an English word with German roots, if ever? Edit: Formatting [link] [comments]  |
| Posted: 17 Mar 2017 09:44 AM PDT |
| Posted: 17 Mar 2017 06:04 PM PDT These videos show some interesting nuclear explosions and I was wondering why the explosions are not more uniform and what's causing the parts of the explosion that protrude or seem to be moving faster than the bulk of the expansion. [link] [comments]  |
| Posted: 17 Mar 2017 01:23 PM PDT Think about two comparable people but one lives in Russia (doing outside work year-round) and one lives in Vietnam with no air conditioning. Does long-term exposure to heat/cold noticeably change how our bodies work? Is there any research with conclusions like "people in hot countries metabolize fat quicker" or "people in cold countries have lower cancer risk"? All I know is that it's probably hard to make comparisons with large groups of people because genes, diets, and healthcare in colder countries are different than tropical ones. Still, I'm wondering how much temperature matters. I appreciate any insights you guys could share on this. [link] [comments]  |
| When was the equation of gravity first formulated? Posted: 17 Mar 2017 03:29 PM PDT I initially thought it was from Newton's Principia but I can't find any sort of page reference to an equation, only general thoughts on the inverse square relation between F and r. [link] [comments]  |
| Why do we get stuffy/runny noses when we cry? Posted: 17 Mar 2017 02:16 PM PDT |
| Will all the Lithium-ion batteries we keep in our attics ignite eventually? Posted: 17 Mar 2017 12:10 PM PDT Won't each one of them ignite as soon as their protective layer fails to keep the oxygen out? Or do they somehow "disarm" themselves over the years? [link] [comments]  |
| Posted: 17 Mar 2017 08:01 AM PDT |
| Posted: 17 Mar 2017 06:44 AM PDT I work in a clean room doing microfabrication work. I've noticed that when looking through a microscope, if you lower the stage very far, beyond the working distance of the tool, eventually a plane will come into focus where you can see stationary particles/debris (they don't move when the stage is moved laterally, so must be somewhere within the microscope - many I've asked agree this is likely a view of the surface of the objective lens). Why do these particles come into focus? How does lowering the stage change the plane of focus to a point far above the stage, presumably on the objective lens, or even higher up in the optical pathway within the microscope? I've asked a number of the smart people in my lab but nobody can explain it. [link] [comments]  |
| Why are some colours easier to see on a black background than a white, eg yellow? Posted: 17 Mar 2017 10:04 AM PDT This picture demonstrates what I mean. It's easier to see the yellow on the black background, and it's easier to see the purple on the white background. Is the reason similar to why, when you print out a colour picture in monochrome, red and purple appear black whereas yellow appears white? [link] [comments]  |
| Posted: 17 Mar 2017 11:05 AM PDT https://en.wikipedia.org/wiki/Light_cone shows a 2D graph where y-axis in (x, y, z) is replaced by time so the reader can visualize the concept easier. Although it is in fact easier to visualize the future light cone I'm having trouble understanding the concept of past light cone. It is stated that the past light cone behaves like the future light cone in reverse, a circle which contracts in radius at the speed of light until it converges to a point at the exact position and time of the event E. In reality, there are three space dimensions, so the light would actually form an expanding or contracting sphere in three-dimensional (3D) space. Let's imagine we light a candle and now there is light. If we rewind to a time before we lit the candle, there is no light. However, in spacetime, and according to the graph, there is and it contracts at the speed of light until it converges to the exact position and time of lighting the candle. How is it possible that there exists light in some other plane that is undetectable to us, and the moment I light a candle it shows itself? And why is the past light cone considered to be future light cone in reverse? [link] [comments]  |
| Posted: 17 Mar 2017 07:31 AM PDT As an example, there was this study on guppies that showed that rarer male morphs had a sexual selection advantage over common morphs. Is this effect observed often enough to have its own name, or would it just be subsumed into the more general category of 'negative frequency dependent selection'? [link] [comments]  |
| Posted: 17 Mar 2017 07:56 AM PDT It just seems to me that the table should be a perfected organized shape instead of having hydrogen and helium alone at the top and then the Lanthanoids and Actinoids being shown oddly at the bottom [link] [comments]  |
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