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12

Snopes.com gives a discussion of possible issues with the original experiment. Evaporation or bowel or body movements for instance. I think the biggest complaint about the experiment is that it has not been reproducible and that the original experiment was flawed. MacDougall only took six measurements and he threw two of them out in his original work. ...


10

Yes, it can, but it is extremely rare. ... nosebleeds are rarely fatal, accounting for only 4 of the 2.4 million deaths in the U.S. in 1999 [1]. The main issue is that epistaxis can be a sign of potentially fatal diseases: The instances in which nosebleed is potentially fatal are those in which there is a history of recent head injury, severe ...


8

Nope, you wouldn't die instantly. While explosive decompression has never been tested on humans (for obvious reasons), the dangers of a vacuum have mostly to do with the pressure differential between your body and the now pressure-less void around you. The most fragile parts of the biological system would be the lungs and ears, and the instantaneous ...


8

About 52 to 74 days according to hunger strike wiki page. This wiki page bases its data on 8 persons who died due to hunger strike: Days survived by each person: 66, 59, 61, 61, 61, 46, 71, 73, 62, 60.


6

Long story short, the astronaut probably wouldn't make it, and would first loose consciousness then suffocate. There is a lot of myth and hollywood dramatization regarding this kind of thing. Here are some: You will explode. This is just ridiculous. The skin is air tight (relatively speaking). It is also very elastic and can pull and bend quite a great ...


6

One other important event that can kill the person is that the atmospheric pressure on Mars surface is less than one percent that of earth at ground level. Suddden exposure to extremely low atmospheric pressure will immediately release dissloved gases within blood and and other body fluids as bubbles and the individual is likely to get a very severe form of ...


5

You will be hard-pressed to find any scientific data on this question. Psychology in humans is already a difficult study, at times failing to demonstrate results with real scientific rigor. When studying animal psychology, you face another substantial barrier - language. Although some primates have been taught to communicate with sign language, the best of ...


5

Any injury, that results in external bleeding can lead to death, since it is a breach in the body's defenses and an entry point for pathogens. Explanation: When you have nose bleeding the blood must be coming from somewhere. Usually from inside your body. That means there is a hole in your body which is big enough for blood to stream out. That in return ...


5

This would vary a LOT depending on the amount of stored fat, previous diet, the weather and even the water drunk. Weeks though there is a good chance that a loss of electrolytes can cause health problems. (that's why I mention the water you drink, because many bottled water brands and wells have a bit of salt in them.) Its hard to say from anecdotal ...


5

Although both involve DNA fragmentation, the pattern produced is very different. During apoptosis, DNA fragmentation is done in a regular, controlled pattern, which if run on a gel produces a characteristic "ladder" pattern. Necrosis, on the other hand, is a more stochastic process, and will produce a smear. This details the difference rather nicely, ...


4

I very much doubt it. You may however die from whatever's causing the pain. The reason you feel pain is so you stop doing whatever is causing the pain. Hence someone knows not to touch a hot fire because it is painful. But the pain itself is not actually the danger - it's the fire burning away skin. So pain is actually a good thing, a survival mechanism. So ...


4

This is very dependent on the organism within each of the groups you mention. While for the most part, archea are the extremophiles and have the ability to withstand many extreme conditions, nutrient limitation survival greatly varies. I think you could easily find organisms in each group that could withstand nutrient limitation well. A good example would ...


3

There are multiple levels of memory, some of which would die immediately, some of which would take some time. So the answer is: it depends; some immediately, some only very slowly. At the highest level, the current neuronal firing state of the brain encodes memory on a very short scale - working memory. The memory held on this level does not have a clear ...


3

Yes it can but it is very rare. Most often when you get a nosebleed it is either a vein or capillary that ruptures. However in some cases it is arterial bleeding which is always an emergency. I have honestly noticed when I have nosebleeds often each one is worse than the previous with some having a lot of bleeding but still no gushing from an artery. ...


3

Yes. Usually only in the case of someone with hemophilia (no blood clotting) but it could theoretically occur with any serious uncontrolled nosebleed. Since blood in the stomach tends to cause vomiting, you could also lead to a scenario where someone who was uncomfortable with blood would pass out due to being scared of the blood and then aspirate (puke and ...


3

I think the key is "his fragrant corpse." When an animal dies and begins to rot, a number of quite smelly chemicals are given off, including putrescine and cadaverine. Crows and other carrion birds like vultures are probably very sensitive to these compounds, rather like sharks are to the smell of blood.


3

Less then a minute breathing in the atmosphere (and a very painful death). Mars' atmosphere is >95% CO2 with only trivial O2. These are atmospheric conditions similar to those used to euthanize laboratory animals. He probably wouldn't even make it 200 meters before suffocating.


3

For car crashes, it's a mixed bag: Better Better Worse Worse Basically, it looks like, if wearing a seat belt, slightly overweight is more likely to survive a car crash, but if no seat belts are worn they are at a disadvantage; the very obese are always more likely to die, however. Also, some of this was found only for males, not females.


2

Some theories: Dead bodies died of something. In the earliest ages these were generally infection. Burying them protected us from something that could kill us too. This is also why we would be evolutionarily programmed against cannibalism They make great fertiliser. Burying waste, dead animals etc resulted in the growth of plants etc which not only food we ...


2

According to Wikipedia Electric shock, the Magnitude of electric shock to a body is mainly due to current as well as voltage. Various factor of the environment will also play a major role in damaging the body while under contact. The following quote explains it: The minimum current a human can feel depends on the current type (AC or DC) and frequency. A ...


2

Alain Bombard He is a french biologist who voluntarily tested how many days a man can survive drinking seawater and how? Biologist point of view Sea contains ~3.5% of salt$^1$. Our kidney separates the waste from water and excrete them in urine provided the salt content is less than ~2%.$^2$ So, it will take the water already present in the body. ...


2

The issue I suspect you are struggling with is the anthropomorphization of the evolutionary process. Evolution is an optimization process driven by random mechanisms...i.e. there is often not a "reason" for why certain things are the way they are. Evolution is not a conscious "designer" that produces things with a specific goal in mind...it simply "picks" ...


2

Carrion birds, such as crows and vultures, eat dead animals. As a whole, it's possible that they detect carrion by the smell or visually. Crows specifically are omnivorous and predatory in addition to being carrion scavengers. I suspect that they will try to eat anything that doesn't fight back, especially if they are hungry enough and there is exposed ...


1

Once the thermodynamically irreversible processes we call brain-death have occurred both memories and the machinery to retrieve them are lost. This is not an answer but a cavil with the premise of the question. Challenges that do not destroy the brain itself are different from those that do. In particular there may be a big difference between hypoxia ...


1

Perhaps the best type of study to examine the role of genes (DNA) in human aging are twin studies. They have either: the same DNA (monozygotic, one egg, "identical" twins (MZ) ) or similar DNA (dizygotic twins, two eggs (DZ) ) and are perhaps exposed the same, or different environments. I won't repeat the information in the link, above, but studies of ...


1

Dimethyltryptamine have been identified as normal constituents of human blood, urine,cerebrospinal fluid.Dimethyltryptamine is an N-methylated indoleamine derivative, a serotonergic hallucinogen.It apparently acts as an agonist at some types of serotonin receptors and an antagonist at others.DMT is traditionally associated with indigenous Amazonian people, ...


1

This article deals with the issue in detail.


1

Yes it can. Usually this is through an increased rate of suicide or the inability to look after yourself due to the level of pain you are in. It is so common that there are so many medical departments that have the sole job of pain management. Pain itself is not designed to kill you (in fact the very opposite as highlighted excellently by Cuana), but as ...


1

1 year and 17 days only on water and electrolytes. Actually, he went water only for about 75 days (read that elsewhere, can't remember) and then they supplemented his water only diet with electrolytes. He's done it under medical supervision and gained 7 KG in 5 years after the fast. So the weight does stay off (obviously, if you go and stay into a healthier ...


1

You can remember this easily as the rule of threes: You can survive: 3 minutes without air. (death by asphyxiation) 3 hours without shelter (death by hypothermia, heatstroke). 3 days without water. (death by dehydration) 3 weeks without food. (death by starvation) Going beyond those guidelines will generally do you permanent damage. Further reading: ...



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