Human Definition and 880 Threads

The CO2 level of 600 ppm is already compared to the effect of a stuffy room. At high concentrations, a feeling of suffocation occurs, as well as headaches and even an increase in intracranial pressure. I have also read that this gas slows down mental activity and reduces the level of motivation...

The problem per se is pretty straightforward: ##s_m = \frac{\Delta p_m}{v \rho \omega} \approx 1.1\cdot 10^{-11} \, \textrm{m}## I found an exercise similar to this in a translation of Cutnell and Johnson's "Physics" 9th edition. I could not find the problem in the original version of the book...

Daedalus 88 is a human powered aircraft built in 1988 by MIT students. I'm trying to find research papers describing the construction process but can't find anything. So I'm asking here: what books should I be reading to start building this? I My math skills are up to basic calculus. Last time...

Hello there! Who belongs anywhere; am i right? It’s a whole bag of worms. Or strings. Planks? Anyway, im not a student currently and on the rare occasions that i can afford to sign to sign up for a class or two I'm more of a liberal arts kinda guy. As stated above i googled “Metaphysical...

I'm asking in order to understand if the only difference between the DNA of all living things is merely the arrangement or sequence of their letters. This is more of a curiosity question, not about sci-fi or current feasibility. Could the letters of a human DNA be reordered so it's identical to...

Popular science: https://www.livescience.com/health/genetics/1st-draft-of-a-human-pangenome-published-adding-millions-of-building-blocks-to-the-human-reference-genome Nature (open access:) https://www.nature.com/articles/s41586-023-05896-x A pangenome is a genomic map using extant variable...

The human body is made up of mostly oxygen, hydrogen, nitrogen, carbon, calcium, and phosphorus. Less than 1% is sulfur, potassium, sodium, chlorine, and magnesium. If a human body was teleported to the surface of the sun, what would happen to these elements? Which ones would cease to exist...

"The fossilized find, first uncovered two decades ago, suggests that early humans regularly walked on two feet some seven million years ago. This new analysis, published today in Nature, makes a strong case that Sahelanthropus tchadensis, a species that lived during the critical time when our...

There has been an explosion of discussion among experts about the evolving/growing dangers of AI and what to do about it. This debate has gone public, largely due to the recent success of generative AI, and the rapid pace of improvement. As an example, AI models which can generate images based...

Nikola Tesla, the prominent 20th century inventor, stated in his book "My Inventions" that all human movements appear to come from the will but are are actually generated from the outside. He goes on to say that this phenomenon is of incalculable vale to the human race and he urged further study...

my notebook says that we can rewrite the integral $$\int {75\sin^3⁡(x) \cos^2⁡(x)dx}$$ as $$\int {75 \cos^2(x)\sin(x)dx} - \int {75\sin(x)\cos^4(x)dx}$$ however, i have literally no idea how it got to this point, and i unfortunately can't really provide an "attempt at a solution" for this...

In another thread the concept of how many seconds in a year came up and it made me think of putting milestones of a human lifetime on a log scale. Units are seconds. Please feel free to amend or change or just make it better. Maybe an actual plot? What strikes me is most of life is in the last...

From my point of view: 1) survival 2) do something good to satisfy your inner soul and for others. 3) help to continue the race of human being 4) and die What others think about life?

I recently read that there is enough hydrogen in the human body to lift 195 lbs off the ground. I know this sounds super-silly but if we ever develop nanites; could they manipulate the hydrogen and allow us to float?

Just the summary as written. My own impression WAS that Pepsi Cola was a little sweeter, and Coca Cola was spicier and slightly less sweet. I do not remember my impressions of other colas. I would be interested in other details which members may tell.

I'm interested in chemistry but it's all new for me and I'm just starting out. I tried to do some calculations but got stuck... I was wondering, for example a supplement has the following values: Molar mass: 306.247 g mol-1 Tmax 2-4 hours Cmax 363.3 ng / ml Half life: 11.21 hours How do...

NY Times article here. Paywalled Nature Human Behavior article here. bioRxiv preprint here. Sing-songy talk to babies has been observed in Adults of any culture seem to be able to identify baby talk in any other language. Many think that baby talk leads to more adult language development...

I was having trouble with a physics problem (string tension dynamics) In this case I have a model that simulates the phalanges of a human finger. Each phalanx is a block of mass m1, m2 or m3 respectively. And to simplify it, consider the 3 equal masses. These phalanges are linked by joints that...

Hi, How does a human eye classify any shape as a circle, square, triangle etc.? Let's focus on a circular shape. Suppose we have a circle drawn in white on a black surface. The light falls on the retinal cells. I think the light falling on the retina will constitute a circular shape as well...

I'm sure this is a strange question, but I am really curious as to whether the human body can produce electromagnetic pulses. And particularly, whether an orgasm is a type of EMP. Wikipedia says an orgasm is "a sudden discharge of accumulated sexual excitement". So is this discharge of...

Well since we count all possible posts , including those that have no syntax, no proper grammar or proper words, and no sensible meaning, all posts of length n are something like 100^n (I suppose we have 100 possible chars besides the letters of ordinary alphabet, including symbols like the...

Hi, I often hear people saying that why and how that person could react in such a way , he or she is so intelligent, so educated etc. The statement implies that if a person is considered to be intelligent or educated, he or she could control their emotions such as anger, jealousy, depression...

[FONT=-apple-system] do you think there are biological limits to our capacity to understand physics or mathematics?could it be that in the distant future, no scientific progress could be achieved using the human brain, and we have to depend on superhuman level ai to do the work for us?

Does the human eye see things at the correct size or is there such a thing? I know one of my eyes sees things slightly smaller than the other, but ideally should the eyes biologically not magnifying or shrink anything at all?

Summary:: Looking for a certain degree program What kind of degree would be best if I really wanted to get into studying energy within and around the human body and interactions of it between electronic signals and things like that? I am really starting to believe that our understanding of...

I have been really curious about the possibility of simulate the human's communication hability using computer language/softwares. Most specifically, i have been thinking that the most difficult part of the simulation would be to "cofide" the level of randomness+logic that the human brain can...

What is in our DNA that separates us from other primates?

Back in grade 10..,.( Oh my that was awhile back 😀 ) our electronics teacher passed around a multimeter and everyone measured their resistance ( a lead held in each hand, Fluke was set on infinite ). All in the class measured between 700K and 800K approx. All except me that is. I measured 1.4M...

I just listened to a great podcast on the explosion of human genomic data about human migration, which ties in with the spread of ancient language groups, and reveals some of past cultural practices. It is Sean Carroll's Mindscape podcast #179; David Reich on genetics and ancient humanity...

Summary:: How fast does a human sized object(or a human) need move so I won’t be able to see it at all if it passes right next to me? Im trying to figure out something in regards to the Flash movies/Flash series but I’m super bad at calculations and math :( Do you think that mach 2...

I was in doubt if this is the right chapter to place this thread, but it seems there are many talents just here. "we were observing from a decent distance through optics. The weather was frosty, clear, calm. When хххххх appeared from under the arch of the house (he was хххххххх to walk to the...

Perhaps psychology is not exactly a "science" in a STEM sense, but understanding human irrationality is these days important more than ever before. To beat the pandemic or the climate changes, we have to cope not only with medical and environment issues, but also with human irrationality. Some...

When a Mars Simulation Goes Wrong https://www.theatlantic.com/science/archive/2018/06/mars-simulation-hi-seas-nasa-hawaii/553532/ The article came across my desk (computer screen). Human behavior is complicated. I'm more interested in the technical side of space travel, specifically the...

I gotten randomly hooked on this lecture series by Prof Sapolsky, I thought I'd share in case anybody felt like giving them a watch or discussing some things you found interesting

In competitive rowing, the more people in a boat, the faster it goes, but what is the ratio of additional human to speed, and what is the theoretical limit? If I could fabricate a boat where each additional person added 100kilos, 100watts of power, and 1 meter of length to the wetted surface...

Hello, I need to scale down a human model by 1:20 i.e, i need a human model of 9 cm height scaled down. Help me calculate the weight of the 9 cm scaled down human model. Regards, Viky

I know this is a hypothetical question, but we can still have a general idea for how we could do it in the future. I wonder how theoretically with good enough technology a human can achieve a super-human strength(or close to it) without large muscles or non-biological components attached to...

A six way, all out release of humanity's entire stockpile of "engineered criticality devices" and slag the planet. The damned aliens were exterminating humanity anyway, why should they get what they want, while we go black? I'd bet money neither the movie's writers nor the extraterrestrials...

I was wondering how many visible photons humans emit in a day. I did all the calculations with the Planck's Law (it's quite easy, because in the visible spectrum and for temperatures above 0 degrees the exponential term is much larger than one, and the "-1" can be taken out of the integral...

Two studies on human brain evolution/development. FIRST A new study is the first to identify how human brains grow much larger, with three times as many neurons, compared with chimpanzee and gorilla brains. The study identified a key molecular switch that can make ape brain organoids grow more...

Hello All It seems to be accepted wisdom that the human appendix is gradually getting smaller, and eventually it will disappear altogether. Is there any evidence that this is true? For the organ to get smaller generation by generation, wouldn't there have to be a selective advantage for...

Can we use the electricity from the muscle to power an engine (like a prosthesis)?

I'm past middle age, and it seems I should have fewer questions about life and the universe than ever. I have more now. For some reason this past year or so I've been absolutely consumed with trying to grasp the immensity of the universe and distances. For whatever reason, I'm having more...

Hi, Does the brain control the physical growth of a human baby? I think if, for some unfortunate reason, the brain is absent, the growth would still take place normally but more like a vegetable. I don't think if the brain is absent, one can even blink the eye or move a finger. But the...

I was researching what the total electrical resistance of the human body was and got some quite far ranging values. It seems to range from 1, OOO to 1OO,OOO ohms. Some quite elaborate ways of testing it too. Then I thought I'd just get the old multimeter out. I have two and both measured about...

Hi! So my question is: how to human brains detect false irregularities in faces? With false irregularities in faces I mean aspects of for example deepfake faces or photoshopped faces which show irregularities that are not normal to appear in an observed human face (for example weird lines...

I want to do a project for my class on the obstetrical conundrum. Which is basically the antagonism of selective pressures on pelvic morphology. I need help to find literature. I want to know if over the course of history, if Human baby's fontanelles increased in size in order to compensate for...

I was reading this: https://www.cnbc.com/2020/12/01/elon-musk-highly-confident-spacex-will-land-humans-on-mars-by-2026.html It just seems that the Delta-V requirements - especially with a spacecraft that is stocked with supplies for a few years or for the Hohmann transfer helio-orbits - will...

The NY Times, on the 20th anniversary (on Halloween) of the ISS being continuously occupies, published an article (with lots of pictures and a really cool time line) showing what the inside of the ISS is like. Duct tape on the ISS (didn't see any WD-40): Galley: Science stuff:

I thought of my experiences with night vision when I happened upon this essay (Into the Night). To stay in best health, I do a two-hour, six mile walk every day. In the summer (when the days are hot) and the winter (when the days are very short), I often choose the night for this activity - and...