Human Definition and 895 Threads

...assuming very slow adaptation is possible. How low can one go? And something else: if you're at very low pressure, water or blood would boil at RT (pressure is lower than the vapor pressure of water). Would this mean a relatively innocent cut wound would make you lose a lot of blood? The...

Hi all, Sorry if this is an incorrect part of the forum. Living a relatively sedentary lifestyle, consuming a Western diet, living in an area where drivers see pedestrians/cyclists as moving targets to run over and after packing on a few pounds, it got me thinking. I'd like to (as a...

I wana become good at math and physics, and become a mechanical engineer. I will like to make contributions to society. But can you be good at this withouth loosing a balanced social life, having a girlfirend and friends and make some exercise xD.

I'm finding it hard to describe what I mean, but here it goes. According to the evolution theory monkeys, apes among others, and humans have a common ancestor - their hereditary line of ascent leads to a common forefather(s). As evolution predicts, let's say, male nipples is a proof that human...

In the movie Terminator, Arnold Schwarzenegger lifts someone up by the neck and, with both arms fully extended and horizontal, holds the person off the ground. If the person being held weighs 650 N, is 60 cm from the shoulder joint, and Arnold has an anatomy analogous to that in the figure...

Recently watched a documentry(BBC Horizon - How Many People Can Live on Planet Earth 2009) and its scary, could be worse than Global warming.. There are almost 7 billion people in the world today and numbers are increasing rapidly. Soon there'll be 8-9 billion people and we'll all feel the...

it comes together as it goes on ask any questions you'd like So the last couple weeks iv been kinda in a little engineering stage thinking about different ways to produce power and what not in this transition from school to life iv came up with a lot of good ideas and I mean it lol I...

Homework Statement A human bone has a youngs modulus of 10^10 N m^-2. It fractures when the compressive strain exceeds 1%. What is the maximum load that can be sustained by a bone of cross sectional area 3cm^2? Homework Equations? F= Y*(change in length/ original length)* cross...

I need to know if this stuff http://www.coleparmer.com/catalog/product_view.asp?sku=8809762&pfx is safe for human consumption. Camphoric acid is supposed to stop sweating in wasting conditions. I had a sympathectomy and can't go outside in the summer without looking like I climbed out of...

I know that Earth has a surface pressure of 101.325 kilopascals. So right now we are all under this pressure, but what types of pressures will we start to die at? high and low pressures in pascals please. Thanks.

Hi, I'm really not sure what NASA's requirements and such are, but have you ever considered that NASA may very well end all manned space programs in the near future? There are a lot of people who want to see NASA's budget all into robotic exploration.

Hi, I'm trying to compare the spectrum of male and female voices using Matlab. I'm using this code but I get this error: --------------------------------- Warning: SPECTRUM is obsolete and will be removed in future versions. Use the spectrum objects instead, type "help SPECTRUM". > In spectrum...

My biology teacher asserted to our class that compared to the vastness of the atmosphere of our earth, the amount of harmful gasses we are emitting is a fraction of a percent and therefore can be dismissed as harmless, and instead we should be worrying about more fragile ecosystems down here on...

I was wondering if any values for this were ever recorded. How strong is human skin when subjected to pressure? Since there are figures for steel which constitutes classical armor and values for bullet proof vests, I wanted to work out what magnitude of protection those things give you against...

Do you think that the human species will survive long enough to produce a new subspecies or a separate species? Personally, I think we are doomed to kill ourselves off prior to an new development. However, our species comes from a long line of individuals that have adapted and survived many...

please can anyone help me to figure out the equations of human body movement ( walk ) I am in need so badly .. Best Wishes

From the breasts to the genitals, when did humans want to start covering themselves (not for protection), and what made them ashamed of their body? No bible jokes please.

I was wondering how the total amount of water in a typical human varies by weight and sex. I saw a site claiming that the typical male/female water percentages by mass were 62% for men and 51% for women; fair enough, though I've seen higher figures. (I'm more concerned with the ratio between...

the human voice...?? Homework Statement The problem asks to explain the physics involved when humans are speaking. and by speaking i mean a normal loudness, casual talking to friends kind of speaking. Homework Equations Not sure if there are relaly any equations to this one...but maybe...

I was reading about a tribe in Africa and how they have not changed there ways for thousands of years. There are a few of these tribes left in the world. All these tribes can only have 3 outcomes. They breed with us, they go extinct, or they remain the way they are. If the third prevails...

Just curious on your opinions. Do you think humans actually have souls, separate from their mind and body, or is it just part of a chemical process within our minds? I personally believe that people have souls, but it's kinda confusing, because they can seem to be altered by drugs and...

http://en.rian.ru/russia/20100329/158353194.html I didn't even realize that human cloning was yet scientifically possible. I know that some scientists cloned a sheep many years ago. But other than that, I didn't know people could be plausibly cloned yet.

Reference: http://www.stltoday.com/stltoday/news/stories.nsf/sciencemedicine/story/0A6FFAE533258165862576F100115AB1?OpenDocument" http://www.time.com/time/health/article/0,8599,1974903,00.html"

How to calculate the height of a person climbs from the third stair up? i don'[y know how to calculate it. HELP! I have the mass=68kg, individual step height=0.16m, number of steps in flight=12 additional question: calculate the average power each person exerted while climbed the stairs...

By unification I mean a unified theory of everything. And I am implying that this hypothetical unification would bring forth a whole new level of technology, and assuming that it's application could range from tools of war and destruction, generally speaking god like power. But would also...

From Wikipedia talk page on time travel: Do you believe this statement? "If the human mind can think it, it can be done"

Scientists have reportedly been able to transport atoms and molecules as much as 1800 feet. Could the same be done for humans, or would the Heisenberg Uncertainty Principle ultimately make it impossible?

Hello, I want to build a circuit that can put about 350 microA in my body(to study muscle reflexes etc.). Until now I've come to the conclusion that I need DC in order to get a definite direction of the current. Can anyone help me in figuring out what kind of AC/DC transformer and what output...

I just completed a lab in which we created standing waves in a fixed length of pipe using a function generator. An oscilloscope was used to measure the amplitude of the waves. The frequency was changed until a resonant condition was met, and then the location of all the nodes/antinodes was...

For this problem, I tried using the equation: ac=V2/r and put in 2000= ((2*pi*r)/(1/58))2*r What is the distance of a sample of blood from the rotation axis of a centrifuge rotating at a frequency f = 3480 rpm, if it has an acceleration of 2000g?

If there is a 50/50 percent chance that offspring could be either a male or a female (at least that's what my bio teacher tells me) then what are the chances that the male/female human population is (for the most part) split 50/50?

Homework Statement The far point of a nearsighted person is 6.0 m from her eyes, and she wears contacts that enable her to see distant objects clearly. A tree is 18.0 m away and 2.0 m high. (a) when she looks through the contacts at the tree, what is its image distance? (b) How high is the...

With advances in medicinesin 1800s and now the avg life expectancy being higher than reproductive age what could be driving human evolution? something like : Hundreds of Human Genes Still Evolving http://www.livescience.com/health/060308_human_evolve.html I understand genes could change...

Is it culture or genes or both that drive some groups to have high completed family sizes?

Say I have a space suit that is heated only by the heat generated by my body and I am located in deep space where the only heat is from the microwave background. If I kept putting more and more of the best insulation around me will I stay warm? Is there a theoretical limit to how much I can...

Does this make sense?This is the sensitivity of the 3 human cone cells. http://img192.imageshack.us/img192/4562/28030351.jpg This is the range of different colors that the human eye can see. http://img696.imageshack.us/img696/9397/31986914.jpg This color would appear white...

This is my first post, so sorry if this is in the wrong section. I just came across an article which stated "At any time, it is estimated that there are some 10 quintillion (10,000,000,000,000,000,000) individual insects alive." Now, this got me thinking about the number of humans on...

Is the homo-sapien the final stage of human evolution? I've heard of a hypothetical "homo-superior," but I'm not sure if that is actual science or pseudoscience.

Hi, I'm a cyclist who has just got some rollers, which allow me to ride inside without going anywhere - essential if I want to ride on harsh winter days. The problem is, without the cooling airflow normally experienced when out on the road, heat exhaustion makes long periods of indoor training...

Hi all, I am a little bit confused about the concept behind Human Leukocyte Antigen (HLA). Part of my project right now requires me to do HLA typing from the blood samples with flow cytometry. Here are my questions. 1. The difference between between HLA class I & II compare to MHC Class I &...

What are the major weightlessness discoveries in the history of the human race and how will they be of benifit to our future?

If a full scale thermonuclear war were to occur, would it cause the literal extinction of the human species, as well as life on Earth as a whole? I've read about military supercomputer simulations of this scenario, and does not result in human extinction. Although many Billion people do die...

What biota with the autonomous potential for reproduction does the human body create besides viruses and babies?

Chimpanzees share 98.4% of our DNA, does that mean that Chimps can eventually evolve into a human form of biological life. Questions does this 1.6% difference mean that chimps lack the DNA sequences to eventually evolve or are the existence of the DNA sequences just not present and they don’t...

The UNDP has made a new ranking: http://hdr.undp.org/en/statistics/ Norway is still the best country to live in. Top ten: Norway Australia Iceland Canada Ireland Netherlands Sweden France Switzerland Japan

As we all know, some bacteria are good and beneficial to human beings. How about viruses? Is there any good viruses that can be used for human beings?

Human population verses time, Fourier transform of that "function". Let the human population of the Earth be plotted verses time. Assume that this function is almost continuous. What would a Fourier Time Transform of that function look like? Is there a "strong" exponential component of...

Evolution :biggrin: Perhaps we can turn this into an educational thread for future reference? I'll start off and add more. From the National Human Genome Research Institute. Watch Darwin at 200: How Geneticists View Him Today by listening and watching this video from The National...

http://www.ucar.edu/news/releases/2009/arctic2k.jsp The associated albedo flip will amplify the warming.

Strangely enough, given that this is something we all do all the time, the nature of human communication seems not to be at all well understood. Here’s my take on this – Other animals “communicate” in a certain sense – that is, they make noises or other signals that affect each other’s...