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  #921  
Old 15.01.2010, 18:41
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Re: Ask a Scientist

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I also have that I don't think it's a myth... Also why do people yawn when they see other people yawn? (I saw someone say there is no such thing as a dumb question !)
I remember reading the answer to this somewhere a few years ago -- I think it was the learned journal Nature's spoof awards for the best improvised explanations for various phenomena. The question above was answered as follows: one yawns to equalise air pressure in the ears. Inhaling a large quantity of air achieves this objective. However, the sudden intake of air results in a reduction of the air pressure in the immediate vicinity of the yawner. Other people also present in this vicinity consequently suffer an imbalance of air pressure in the inner ear, so they have to yawn to equalise their air pressure ...

Sounds completely plausible to me!

Good news, Marrakchi, you've reached that 10 posts mark ... the bad news is that you can't thank posts in some of the Off-topic fora!
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  #922  
Old 15.01.2010, 18:43
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Re: Ask a Scientist

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I ll give it a shot.
If a person was to be decapitated (as in torn into 2 bits without damaging the heart or lungs) cause of death could be the following
1. it is possible that due to the shock of the decapitation he suffers a heart attack and dies (this could also happen due to seeing the monster come for you)

2. secondly due to server damage to the body, vein / artery rupture the person would loose consciousness rapidly and eventually die(I would assume a few minutes).

3. Lastly, most animals don't just swallow but chew or squeeze their prey which will least to suffocation, crushing of important internal organs e.g. Crushing of the rib cage, puncturing the lungs etc
The cause of death of every person who ever lived is brain death due to stoppage of oxygenated blood to the brain. Technically, there is no other cause of death!

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A rupture of the abdominal aorta, which is an inevitable consequence of the being cut or bitten in halves, would most likely result in almost immediate unconsciousness due to an almost total loss of blood pressure in the brain, I venture to say, within five seconds at most. Actual death will take somewhat longer, but that will be the least concern of that guy.
Exaggery.
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  #923  
Old 15.01.2010, 18:51
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Re: Ask a Scientist

Terminal Velocity - Chapter one
http://en.wikipedia.org/wiki/Terminal_velocity
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But also it would eventually reach a terminal velocity.

So: speed up (depending on initial force), then slow down.
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I would say this is dependant on the snow cohesion (water content dependant?) and the slope angle. Could go either way
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  #924  
Old 16.01.2010, 10:04
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Re: Ask a Scientist

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I also have that I don't think it's a myth... Also why do people yawn when they see other people yawn? (I saw someone say there is no such thing as a dumb question !)
I heard it's only supposed to work on people who like you/ are friends.

We are supposed to have "empathy circuits" (mirror neurons) in our brains.

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Mirror neurons represent a distinctive class of neurons that discharge both when the monkey executes a motor act and when it observes another individual (a human being or another monkey) performing the same or a similar motor act (Figure 1). These neurons do not discharge in response to the simple presentation of food or of other interesting objects. They also do not discharge, when the monkey observes hand actions mimicked without the target object. Thus, the effective visual stimulus is the observation of a hand interacting with an object (Gallese et al. 1996, Rizzolatti et al. 1996a).
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  #925  
Old 16.01.2010, 10:15
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Re: Ask a Scientist

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As for water not being incompressible I believe that to be incorrect.
Strictly speaking, you are correct. That is, water is slightly compressible. All liquids, all matter is compressible. Extremes of this are such objects as neutron stars and black holes.

In the normal domain of temperature and pressure, matter resists compression when the component atoms are on average close enough together for electrostatic repulsion to come into play.

Bear in mind that the elecromagnetic interaction is 10^39 greater than the gravitational interaction. So the mass of an atom and the density is not really significant. To put it another way, it is said that if we took two 10g metal discs about the size of a CHF 2 coin, and took 1% of the electrons from one and gave them to the other, the electrostatic repulsive force would be around about the mass of the earth at a distance of 1cm.

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I remember reading in school about water when subjected to high pressure can convert to solid form(I forgot the pressure and temperature but it was definitly not 0 degrees celcius). this "HOT ICE" will be denser than water.
If you cool water fast enough, it will not have time to form large crystals and this is known as amorphous ice. It has a density 26% higher than that of water.
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  #926  
Old 26.01.2010, 14:28
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Re: Ask a Scientist

I recently tried to clean my ears using some Ear Candles.
Unfortunately, the heat required to melt the wax burnt
through my eardrum and entire middle and inner ear, and
then the vacuum generated by the candle seems to have
sucked my brain out through the hole where my ear once
was.

I have a number of questions:
  1. Could such a candle really generate enough vacuum
    to do this, or was I already really brainless?
  2. What kind of person would sit there and suddenly
    think "I wonder what would happen if I stick a lit
    candle in my ear?" ?
  3. I've already been recommended this stuff below, but
    I'm not sure whether to drink it, pour it in my ear and
    replace my brain with it, or go out and buy a banjo?

Please help this Bearer of Very Little Brain...

.
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Last edited by weejeem; 26.01.2010 at 14:41. Reason: A horse, a horse, my kindgom for a horse!
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  #927  
Old 26.01.2010, 14:35
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Re: Ask a Scientist

I'm happy to answer any questions of an evolutionary/ palaeontological nature. Also pretty good with general biology and geology.
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  #928  
Old 26.01.2010, 14:37
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Re: Ask a Scientist

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I have a number of questions:
  1. Could such a candle really generate enough vacuum
    to do this, or was I already really brainless?
They weren't sucked out. You were open minded, unlike those fancy-schmancy evidence-based mdeicine Big Pharma shills. Unfortunalely, you were so open-minded, the brain just fell out.

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What king of person would sit there and suddenlythink "I wonder what would happen if I stick a lit candle in my ear?" ?
A "king"? Must be the generations of inbreeding.

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I've already been recommended this stuff below, but I'm not sure whether to drink it, pour it in my ear and replace my brain with it, or go out and buy a banjo?
I've also got a magnetic bracelet for you.
And a device that will let you car go 10,000KM per tank...
And a perpetual motion machine...
And some homeopathic pills...

And...

</derail>
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  #929  
Old 26.01.2010, 14:43
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Re: Ask a Scientist

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I'm happy to answer any questions of an evolutionary/ palaeontological nature. Also pretty good with general biology and geology.
There was a good question a while back which no one answered. Something along the lines of, why do there seem to be more poisonous/venomous/toxic animals in warmer climates. For my part, why does Australia seem to have more than it's fair share of deadly spiders?

Has anyone ever looked into that?
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  #930  
Old 26.01.2010, 14:45
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Re: Ask a Scientist

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There was a good question a while back which no one answered. Something along the lines of, why do there seem to be more poisonous/venomous/toxic animals in warmer climates. For my part, why does Australia seem to have more than it's fair share of deadly spiders?

Has anyone ever looked into that?
I believe it is because the price of failure is greater - i.e. you don't get prey very often, so those animals that kill most effectively/quickly survive, natural selection in action...
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  #931  
Old 26.01.2010, 14:51
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Re: Ask a Scientist

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I believe it is because the price of failure is greater - i.e. you don't get prey very often, so those animals that kill most effectively/quickly survive, natural selection in action...
What about all those that live in jungles and rainforests? Is there a higher concentration in arid areas than others?

Last edited by cyrus; 26.01.2010 at 15:10. Reason: there not their, ugh
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  #932  
Old 26.01.2010, 14:52
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Re: Ask a Scientist

Poisonous/venomous/toxic animals are usually Cold-blooded animals which cannot retain body heat, hence dwell in warmer climates.
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  #933  
Old 26.01.2010, 14:56
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Re: Ask a Scientist

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Poisonous/venomous/toxic animals are usually Cold-blooded animals which cannot retain body heat, hence dwell in warmer climates.
But we have reptiles, spiders and snakes here, yet not many are dangerous.

it also make me wonder why only cold blooded animals are dangerous, I can only think of the platipus right now as a warm blooded animal that has venom, are there others?
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  #934  
Old 26.01.2010, 14:57
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Re: Ask a Scientist

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What about all those that live in jungles and rainforests? Is their a higher concentration in arid areas than others?
Using Australia as an example, the most poisonous snakes around are in the outback. The explanation I gave came from one of David Attenborough's docs, so it must be true

Unfortunately he didn't cover the specifics to answer to your questions...
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  #935  
Old 26.01.2010, 14:58
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Re: Ask a Scientist

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why do there seem to be more poisonous/venomous/toxic animals in warmer climates. For my part, why does Australia seem to have more than it's fair share of deadly spiders?

Has anyone ever looked into that?
My answer would be there there actually aren't more! It's actually a question of ratios. The vast majority poisonous or venomous animals are cold blooded, and thus usually require a warm environment in which to live. Some do live in higher latitudes, for example the adder, but there are fewer reptiles and amphibians found in these latitudes in total... i.e. there is less diversity. So basically, there are more reptiles and amphibians in warmer climates, so it seems like more of them are poisonous/venomous.
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  #936  
Old 26.01.2010, 15:08
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Re: Ask a Scientist

If human form evolved, based on Natural Selection and developed whatever was necessary to survive... Then why havent Men developed self-generating ear plugs everytime the women (wife, gf) start to nag and chew brains?

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  #937  
Old 26.01.2010, 15:10
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Re: Ask a Scientist

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If human form evolved, based on Natural Selection and developed whatever was necessary to survive... Then why havent Men developed self-generating ear plugs everytime the women (wife, gf) start to nag and chew brains?

Why ear plugs? We just tune out of said frequency - haven't you developed that skill yet? It's called selective hearing...
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  #938  
Old 26.01.2010, 15:12
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Re: Ask a Scientist

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Why ear plugs? We just tune out of said frequency - haven't you developed that skill yet? It's called selective hearing...
Hahahahaha... Selecting and hearing at the same time?? Naah... not good with multi-tasking!

I guess you dont get to hear "You are not paying attention are you?"
"I was"

"Ok, then tell me what was I saying?"

And then... its just new beginning to a newer argument!!!

Last edited by Dervaish; 26.01.2010 at 15:29.
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  #939  
Old 26.01.2010, 15:30
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Re: Ask a Scientist

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If human form evolved, based on Natural Selection and developed whatever was necessary to survive... Then why havent Men developed self-generating ear plugs everytime the women (wife, gf) start to nag and chew brains?

Well, you developed a hand with an opposable thumb, right? Which is good, because if your wife/gf reads that, you'll need it.

Ah, evolution, is there nothing you can't explain?
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  #940  
Old 26.01.2010, 15:34
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Re: Ask a Scientist

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Using Australia as an example, the most poisonous snakes around are in the outback. The explanation I gave came from one of David Attenborough's docs, so it must be true

Unfortunately he didn't cover the specifics to answer to your questions...
Actually the truth of it is that Australia doesn't have any poisonous animals. We made it up so that all those whinging POMs wouldn't come and infest our beautiful country.

With that said, drop-bears are by far the biggest killers in Australia and most people outside of Australia have never heard of them.
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