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  #381  
Old 17.12.2007, 15:52
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Re: Ask a Scientist

Vacuum toilets. On the A380 the vacuum fires (actually sucks) the waste material at the speed of a cannon from one end of the aircraft to the other. Get hit by a turd at that speed, and will take your head off. They dont use much water, and can flush in any direction and the pipes can be made smaller.

dave


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another thread derailed? davea in the fray? certainly reproducible!

anyhow, so i was travelling to england over the weekend on Swiss, and a question occurred to me, kind of science related.

I used the toilet AFTER the plane had landed, but the flush was still one of those powerful WHOOSH ones where the waste is really sucked out. I always kind of assumed that there was a little hole in the plane which opened and the waste would be expelled at high speed into the atmosphere. I guess not. So can anyone tell what does actually happen with this type of toilet?

in fact, several questions arose but alas i have forgotten them. i did buy a nice little moleskin diary to start recording things from january next year... if i remember them i will post them forthwith.

krlock3
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  #382  
Old 17.12.2007, 15:55
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Re: Ask a Scientist

Here is some footage for those really interested...

dave


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  #383  
Old 17.12.2007, 15:57
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Re: Ask a Scientist

Vacuum toilets are also used on some trains. For example, the German ICEs have very powerful sounding vacuum toilets - a lot better than the trains in the Netherlands, where pressing the flush button does nothing more than opening a trap door in the toilet bowl, giving you a nice view of the rail line below.
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  #384  
Old 17.12.2007, 16:17
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Re: Ask a Scientist

OK scientists. I heard a couple of years ago that hot or warm water will freeze faster than cold if left out in minus temperatures - or in a freezer of course.

Is that true and if so, why? Is it to do with molecules in cold water being in a more stable state?
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  #385  
Old 17.12.2007, 16:21
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Re: Ask a Scientist

As someone else has already done a nice treatise on this subject and I'm lazy/busy:

link
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  #386  
Old 17.12.2007, 16:29
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Re: Ask a Scientist

Hello Scientists,

Could any of you give me a bit more information over "corneal neovascularization." I have looked all over the internet and really not found anything super useful (I know what it is but beyond that there s not much out there). My main question is, is there anything that can be done in the advanced stages? (but any information would be useful) My brother has this condition, among other eye issues and is kind of at the end of his wits. . . I figured we could only gain from any sort of insight you all may have.

Thanks in advance
Darkphoenix
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  #387  
Old 17.12.2007, 16:29
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Re: Ask a Scientist

Wow - so the answer is in some circumstances hot water will freeze faster than cold. But they are not precisely sure why.
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  #388  
Old 17.12.2007, 16:36
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Re: Ask a Scientist

Yep, that pretty much sums it up. It really is incredible how much scientists still don't understand about something as simple and essential as water.

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Wow - so the answer is in some circumstances hot water will freeze faster than cold. But they are not precisely sure why.
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  #389  
Old 17.12.2007, 17:15
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Re: Ask a Scientist

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Yep, that pretty much sums it up. It really is incredible how much scientists still don't understand about something as simple and essential as water.
Ergo your signature?
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  #390  
Old 17.12.2007, 17:17
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Re: Ask a Scientist

I started saying that in grad school. Whenever something didn't work (which was most of the time), if something didn't make sense or basically any of the sh*tty things that happen during your PhD/doing research. It actually became our lab motto.

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Ergo your signature?
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  #391  
Old 17.12.2007, 17:22
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Re: Ask a Scientist

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I started saying that in grad school. Whenever something didn't work (which was most of the time), if something didn't make sense or basically any of the sh*tty things that happen during your PhD/doing research. It actually became our lab motto.
Don't joke, i'm in the business of making columns of numbers sum up. Nobody can actually tell me if what lies in between means anything or if it's true, so long as they sum up to what the total must be.

That was actually the specification.
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  #392  
Old 17.12.2007, 17:34
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Re: Ask a Scientist

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Hello Scientists,

Could any of you give me a bit more information over "corneal neovascularization." I have looked all over the internet and really not found anything super useful (I know what it is but beyond that there s not much out there). My main question is, is there anything that can be done in the advanced stages? (but any information would be useful) My brother has this condition, among other eye issues and is kind of at the end of his wits. . . I figured we could only gain from any sort of insight you all may have.

Thanks in advance
Darkphoenix
Perhaps if you can say what type of corneal neovasculatization your brother has I can get you an answer. No promises though
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  #393  
Old 17.12.2007, 17:40
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Re: Ask a Scientist

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Hello Scientists,

Could any of you give me a bit more information over "corneal neovascularization." I have looked all over the internet and really not found anything super useful (I know what it is but beyond that there s not much out there). My main question is, is there anything that can be done in the advanced stages? (but any information would be useful) My brother has this condition, among other eye issues and is kind of at the end of his wits. . . I figured we could only gain from any sort of insight you all may have.

Thanks in advance
Darkphoenix
Here I got this as an answer from my sister...
http://www.emedicine.com/oph/topic466.htm
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  #394  
Old 17.12.2007, 17:41
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Re: Ask a Scientist

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Here is some footage for those really interested...
dave


That is totally cool.

Does anyone have any suggestions for reducing the static electricity that I generate when I pet my dog?
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  #395  
Old 17.12.2007, 17:43
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Re: Ask a Scientist

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Perhaps if you can say what type of corneal neovasculatization your brother has I can get you an answer. No promises though
I will have to talk to him (I am not sure if he even knows), I ll post or PM you in the next couple of days . Understood with the no promises bit, thanks for the reply Richard.
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  #396  
Old 17.12.2007, 17:45
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Re: Ask a Scientist

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Does anyone have any suggestions for reducing the static electricity that I generate when I pet my dog?
You can wear a faraday suit

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  #397  
Old 17.12.2007, 17:46
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Re: Ask a Scientist

Increase the humidity in your apartment. This has the effect of reducing static.

Here are some other tips that may help

dave


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dave


That is totally cool.

Does anyone have any suggestions for reducing the static electricity that I generate when I pet my dog?
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  #398  
Old 17.12.2007, 17:47
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Re: Ask a Scientist

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Here I got this as an answer from my sister...
http://www.emedicine.com/oph/topic466.htm

Thanks, didn t see that when I posted before. Cheers
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  #399  
Old 17.12.2007, 17:59
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Re: Ask a Scientist

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You can wear a faraday suit
Great fashion advice.....


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Increase the humidity in your apartment. This has the effect of reducing static.

Here are some other tips that may help

dave
And information. What other things can I get rid of....hmmm
Thanks!
e.
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  #400  
Old 17.12.2007, 18:04
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Re: Ask a Scientist

This might be useful over the festive season

dave



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What other things can I get rid of....hmmm
Thanks!
e.
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