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2

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 ...


5

As @WYSIWYG pointed, muscular atrophy is the main cause for height decrease. A spine injury leads to neural impairment and paresis / paralysis. This affects directly muscular trophism. It also limits physical activity, this being another favoring factor for muscular atrophy and overweight issues [1]. Association of bone degenerative processes (osteoporosis, ...


9

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 ...


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 ...


1

Light can affect retina in many ways [1]: photothermal mechanisms - exposure to intense flashes of less than 20 microseconds that cause a rise in temperature of at least 10 degrees Celsius [5]; photomechanical mechanisms - exposure to flashes shorter than 5 nanoseconds [5]; photochemical mechanisms - light is absorbed by a chromophore and leads to the ...


2

Females are defined as the sex that produces that bigger gamete (ovule) while the males are those from the gender that produce the smaller gametes (spermatozoid). Because producing big gametes is costly, the number of females fix the reproductive limit in the population and in other words the variance in reproductive success in males is higher than in ...


10

I will just show the statistics of last attempt to mimic the brain process. Last year Japan launched there fastest supercomputer: K computer OR SPARC64 VIIIfx 2.0GHz Features: Manufacturer: Fujitsu Cores: 705,024 Linpack Performance (Rmax) 10,510 TFlop/s Theoretical Peak (Rpeak) 11,280.4 TFlop/s Power: 12,659.89 kW Memory: 1,410,048 GB ...


6

Interestingly this effect seems to be true - there is one paper which claims that fasting for three days leads to the depletion of unused (and especially damaged) immune cells to save energy. When food is back at normal rates, the body starts to renew these cells which have been depleted before. This process also seems to enhance the self-renewal process of ...


2

Thanks for the searching and quoting Ilmari. According to some theories, and perhaps there is some research on stool to support these, we can aid our intestines for producing beneficial bacteria by eating PREbiotic foods which supposedly help create a good environment in the intestines for producing healthy bacteria on its own. Some foods that are supposed ...


2

I am afraid you cannot build the classic ECG using only 1 hand. Probably, you can measure HR - heart rate accordingly to pressure detection and similar sensors and from that you can simulate ECG by picture. Simulate I mean you cannot build any reliably ECG curve on the monitor, but can show some waves after every heart beat.


1

Another possibility is K4 device and K4 device. Beyond spirometry it can measure other variables such as: Pulmonary Gas Exchange (VO2, VCO2) Breath by Breath Technology Telemetry Data Transmission up to 1000m Indirect Calorimetry Integrated GPS System Integrated Oxygen Saturation (SpO2) Integrated 12-lead Stress Testing ECG


3

What you are looking for is a spirometer. There are different types of spirometers serving different purposes like the Incentive spirometer and the peak flow meter. I would suggest that you go through the wikipedia page on it to get more info.


1

While it's always possible that a mutated eggplant will produce a new toxin, this is very unlikely. I don't know how much higher the mutation rate is near Fukushima than in general but the difference can't be huge. Even if it's, say, 5 or 10 times higher than normal (I'm making up these numbers), the risk is still tiny. Actually, plant breeders sometimes use ...


2

In general, if you want to know "exactly how much of X on an average is needed to be consumed to cause death", then the magic search term for Google is "LD50", that is the dose that kills 50% of victims. I've seen the LD50 for distilled water quoted as 90ml/kg for rats (that is, 90 ml per kg of body mass). I presume that figure comes not from theorising ...


1

I wouldn't say that a human is "likely" to get sick by drinking from a puddle, I'd say "at some risk". It isn't desperately dangerous, although don't take that as a recommendation. There are many infections you can get from water (bacterial, viral, amoebal, and I presume fungal). You don't want to risk them, but probably won't actually encounter them in that ...


9

During the time when you are not drinking water you still loose some water to sweating and urine. Sweating is (especially in hot climates) an important function of the body to maintain the body temperature in desired range. If this water is not replaced, the body gets dehydrated. This induces a reaction which reduces the activity of the "body thermostat" to ...


3

People with Shorter height may outlive Taller ones. It is a statistically established fact that they are more successful in terms of money, as the study published Journal of Applied Psychology, (Vol 89(3), Jun 2004, 428-441). But, still in the health, the counterpart succeed over the former. The Effect of Physical Height on Workplace Success and ...


1

In cerebral oedema the observations (blood pressure, pulse, respiratory rate etc.) can be all over the place. They can depend on the cause e.g. infectious more likely to have raised pulse (tachycardia) with lower blood pressure (shock) but with the anxiety there might be raised blood pressure. Then with the vomiting, a symptom of cerebral oedema, this could ...


3

The liver does quite a lot of "housekeeping". It is responsible for a lot of energy metabolism: Gluconeogenesis (the synthesis of glucose), Glycogenolysis (the breakdown of glycogen into glucose), Glycogenesis (the synthesis of glycogen from glucose). It is important for protein degradation as well as for amino acid synthesis, as well as in the lipid ...


1

Caffeine is the stimulant in tea. It has different effects on different people, but if you can sleep right after drinking it, it probably isn't strong enough to have long term 'refreshing effects', And yes, the duration of your sleep does matter. If you sleep for 12 hours, much more caffeine will filter out of your blood stream than after a 1 hour nap. ...


1

No, the L axis in the HSL color space does not really correspond to lightness as perceived by the human eye, except in the very crudest sense that, for given values of the H and S components, increasing L produces an increase in the perceived lightness. The L component of the standard HSL color space is simply calculated as the average of the lowest and the ...


9

There are 2 reasons for light to appear red through the eyelids. 1) Eyelids get a rich supply of blood which contains iron (in hemoglobin). The iron in blood absorbs all colors of light but reflects red light (reference). 2) Our tissue transmits red wavelengths of light very well, but it doesn't transmit blue or wavelengths of light towards the blue end of ...


16

Short answer, your eyelids does not block all light. Since they are only a thin layer of skin, the light is able to pass through although not completely obviously. Since the eyes are still completely functional when you close them, only covered by the eyelids, you are able to see when light strikes your face.


4

Alright, so this answer is partially based off the ideas presented by Bobson above. What i did was take his Excel spreadsheet idea and put that into the upper section. Then, I used the amounts used on the website he linked to check the proper amounts needed in the body. I then used those numbers to reverse engineer how much of each compound would be needed ...


3

I think that the advantages of using both hands with equal ease is quite evident whether it be sports, at your work or while you are doing your household chores. An obvious advantage is using both hands to write or draw with both at the same time. I would be focusing on the disadvantages that may be faced. 1) Ambidextrous people are more prone to ...


3

Vitamin A: One study conducted in the 60's claims that vitamin A acid prevents formation of comedones in Acne Vulgaris [1]. Another one conducted in the 70's found no significant improvement of plantar warts when vitamin A acid was applied topically [2]. Vitamin D: Agents like calcipotriene associated with topical steroids are effective against psoriazis ...


1

The three meals a day seems to be a cultural trait. Then what is the optimal number of meals a day? It is not known. Here are the results of some studies: Reduced meal frequency: It was found that the body can adapt to a single meal a day by modifying circulating hormone levels and glucose tolerance [1]. However it does not modify lipogenesis rates [2]. It ...


2

Sun and moon-faking devices exist. Not sure about 'biosphere'. I have personally observed one for honeybees, but that one was fairly crude(bees are dumb). It was just a big room with a hive stand in the middle and a series of fluorescent lights on the ceiling that turned on one after the other. The goal was to mess with bee circadian rhythms and see which ...



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