Other Sciences

Hello! Hope I chose the right department. I am writing a book and in it's final I wanted to create an illusion of the burning Vistula river (Warsaw, Poland). One of the characters is an illusionist and wants to do an act in the popular spot where all the people sit on the banks and have fun, it's right after some bridge. The idea is to create a miracle (a reference to the biblical burning bush that Moses saw). At night in the summer, when people sit on both sides of the Vistula River, I would like to have an effect of a mysterious fire - preferably a wall of fire that suddenly appears above the water and then disappears. Maybe someone already comes up with some …

We may anticipate a resumption of manned lunar exploration within the next five or six years. (See, for example, here.) I am curious about the likely response from those who deny that the Apollo landings ever occurred. Given that the deniers seem to be made up of a mix of trolls, the poorly educated, the gullible and the bloody-minded, I would expect a range of reactions. The poll gives you an opportunity to indicate what you think will be the most common response. Please post the reason(s) for your choice and add any related thoughts. Since this is about the psycholgical response to an engineering approach to pursuing scientific(astronomy & geology), political a…

I saw this documentary on native Indians in America’s and it goes on to say they came about 10,000 to 14,000 years ago and most them are Siberian and Chinese . I find this a bit questionable that they think they came from Russia and China and are people from there. People from China or Siberian do not look like natives. So why does the documentary say that?

Hi. Peaches supposedly grow from seeds genetically equal to the parent plant making it simpler without grafting. Seeds need the stratification period to be viable. What about peach seeds from areas/countries that never reach below freezing ? Do they also need at least an above freezing cold stratification period ?

I am currently reading a paper about complexity. The author starts with a brief introduction to chaos. In the paper it's stated that chaos is defined by stretching and folding. The paper goes on to equate a baker crafting a croissant. The visualization of how two starting initial conditions can quickly diverge is clear in the example. I'm curious if this analogy goes further than just baking however. Can we equate the stretching of the dough to time and the folding of the dough to space? I appreciate any thoughts, and I apologize if direct links and quotes such as this are any type of misstep. Quoted Source: https://necsi.edu/chaos-complexity-and…

Hello everyone and everybody! Here's my suggestion to build a trumpet with traits from both the baroque and the modern instruments, which I call semibaroque trumpet here under. ---------- The baroque trumpet plays about as high as the usual trumpet or even the piccolo one, but its tube is about twice as long, so the musician plays a given note height on a mode twice as high. Higher modes are spaced closer, which enables more notes since there are no valves. https://de.wikipedia.org/wiki/Barocktrompete (more languages there) It isn't usually a natural trumpet, though. Hole(s) in the narrow branches pull the pitch slightly to improve some notes and creat…

For an application with an eddy current not moving in an stream and the following condition exist. The stream bottom is concreted and at an angle, will the eddy's bottom move mostly downhill the concrete.

Hi everyone! A Bb contrabass clarinet to written C has the range of a contrabassoon and the length of a bassoon. Some have a bass clarinet shape, very tall and with very long keys. Others have the compact "paperclip" shape, but they are of metal, which most clarinettists disdain. So here's a contrabass clarinet with bassoon shape. The aspect is unusual and the U-turn is a bit sharp to ease manufacturing. The other features are advantages: Play sitting (rather on the side like a saxophone) or standing. Weight similar to a bassoon. Bassoon makers can produce this contrabass clarinet: passive U-turn, bocal with register key. The double bore body…

Hi. Say we eat a delicious cherry, a watermelon, a tomato, a peach, or pear and keep the seeds after consumption. Heard often that sowing those seeds may yield a cultivar, version, or species different from the seed originator just enjoyed, and to ensure proper fruit harvesting, grafts are necessary. How did nature produced peaches, cherries... for millions of years, and now grafting propagation is needed if we want them to grow in our backyard ? Can someone explain ?

Hello everybody and everyone! I propose to discuss here the acoustic inharmonicity, a theory very well know, especially for musical strings. ======================================== Piano and cimbalom string choirs have different lengths depending on the note height, and the bridge is consequently skewed. The string length varies smoothly on a cimbalom, including within a choir, while piano luthiers painstakingly carve the bridge to have the same string length within a choir and let it jump between the choirs. I claim this results from string inharmonicity. The diameter of a string makes it stiff, which shifts the partials above the harmonic frequ…

Hi. What are the global implications if China tosses the U.S. dollar and mandates the yuan is the currency to collect for their export transactions and to pay for their imports ?

Hi all. Have a couple of young fruit trees 2-3 metres tall which I have never pruned because it feels to me like the growth achieved in a year would be wasted as 'mutilation' loss, plus unclear how much to prune on which branches. The season I believe proper is winter. Does same tecniques apply to different fruit trees ? Like if they are pear, peach, cherry, apple... Applies equally to all ? What about grape vines ? Seen them being horrendously mutilated by supposedly experts. How much is too much ? Does pruning promote fruiting in young or old or both trees ? Any light will be appreciated.

It is easy to find if an article was peer-reviewed, but who reviewed it ? That's important as well. It could have been scientist, which claims nobel prize winners eaten chocolate, therefore eating chocolate increases intelligence... I found an interesting publication and i would like to check who reviewed it. Not sure if there is a way to find out. If site for publications is of high quality, article itself is probably legit, but nothing is 100% perfect. I am honestly surprised, that you can't see who peer-reviewed it as well as names of authors, because it makes sense.

Click the link to view my slideshow. This will include an explanation of each topic and also my opinions FILE DELETED

Hello all. Commercial poison products I do not use to kill weeds are supposed to fade their action in days/weeks/months ¿? I do the guess that has always worked. Gasoline. -Spank me later- A few drops on the weeds and in hours they are dead. On a guess number too, I believe > 99.5% of it evaporates in minutes, leaving very little on the soil (if the weed transfers it to the soil) Whatever is left in soil; what is it and how long would it remain, with what counterproductive effects ? Lately am using salt water, also vinegar, potassium chloride? ice melt solution along fences.

A hypothesis that the Federal Reserve can set interest rates based on the movements of the planet Mars. Here I have data going back to 1896 that shows how the Dow Jones performed when Mars was within 30 degrees of the lunar node. (- from appendix of Ares Le Mandat 4th ed)

Forgive my lack of expertise or scientific knowledge what is a " design freeze" and what does it entail in terms of producing it? Background: the government last week formed a consortium of 4 British bio-tech companies to create an antibody test for CO-VID 19. The statement from one of the companies was "Once the COVID-19 Rapid Test reaches design freeze, then the specification and standard operating procedures will be shared with each party of the consortium to enable manufacturing and/or assembly to be undertaken at each site". Does that mean the test is in the final stage and something that will help get us of lock-down sooner? Appreciate yo…

Hello music lovers (and haters too if any)! The ocarina has an embouchure resembling a recorder coupled with a Helmholtz resonator instead of a tube shortened by side holes Menaglio and more manufacturers ocarina on en.wiki, es.wiki, it.wiki It's often made of terracotta and is very cheap among wind instruments. The fipple saves long training, and some fingering charts resemble the recorder. https://en.wikipedia.org/wiki/Fipple But the range is short, about 1.5 octave, and the instrument lacks horribly power, more so at the low notes. Though, a glass bottle, which is a Helmholtz resonator too, plays much stronger than an alto flute at the same height for ins…

Driving my wife's car, I left the lights on in the parking lot...would not start. Bought an 800 amp Jump Starter. Car started right up. The Jump Starter (lithium polymer) weighs about 3 lb. or less. It states on the box that it will do 25 jumps before having to be recharged...which sounds like adapting it to an auto should be a no brainer. That begs the question: With such advancements in battery technology, why are the current autos still being produced with lead-acid plates? In other words, why havent car makers adopted the technology to make a 3 lb (or less) battery to current vehicles? Please do not guess or speculate. Please...only those who actually kn…

Hello, i wonder if someone could help with the wiring of this power board supply that takes in 240 volts and DC as output. As you can see it has (Ground, 230V, Common) as the three hook up and to the right of common is 4 hook up as the motor RPM. ( 1400, 1250, 1200, 1000) Of the four wires in my circuit panel in my house ( 2 black wires , 240 volts between them,wire A, and Wire B) 1 white wire, Wire C ( 120 volt with respect to the above two black wires.) 1 Bare copper wire , wire D ( no voltage between it and the above three wires). Which 3 of the above 4 wires ( A,B,C,D) should be plugged in to the three hook up on the board. See p…

Hello Scientists. I am a "non" Scientist that has found myself in a frustrating situation. I am currently debating against vaccine denialists on a debate platform. It is a good little platform in that it is fun to debate things. The evil thing about this however, is that the debaters become conflicted in their interests. They begin arguing just about anything, in order to try and gain points from the voters. A good example of this is another person like myself that debates anti-vaxxers, mistakenly found herself debating against me, when she mistook me for an anti-vaxxer. So she unwittingly found herself debating "against" the importance of sanitation, and she di…

i wonder if it possible to increase your memory,thinking speed etc.

I have an optical mouse, not a ball mouse. My dad told me that optical mouses work best on white surfaces, but from usage I find that red surfaces work best. Does it matter what is the color of the surface on which you use your optical mouse?

Hi. If reasonable efforts to germinate seeds result in nothing, is it commonly due to the seeds being from a hybrid plant ? Should that be the reason ? Seeds with zero origin information : Not germinating when following instructions from expert/successful growers-

so incubation period is the time from when you are first affected until you show the first signs and symptoms. this can vary from 2-14 days with the average of 5 days they found according to studies i was wondering 1) if during this incubation period, the virus is contagious 2) also if an asymptomatic carrier is only somebody who is in the incubation period (and maybe covalescent period- after you have the disease but you can still spread it?), *can people in stages such as the prodormal stage and the acute infection stage (the third stage after prodormal)