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General Chat Thread, Nephilims Fact of the Day in General; Originally Posted by timzim Light passing through sodium? Have you ever seen sodium? It's a metal. Dunno where you live ...
  1. #106

    localzuk's Avatar
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    Quote Originally Posted by timzim View Post
    Light passing through sodium? Have you ever seen sodium? It's a metal. Dunno where you live but on my world light doesn't pass through metals. It tends to stop and bounce off.
    It is possible to heat metals until they form gasses. Just look at mercury - it evaporates in normal temperature air.

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    Quote Originally Posted by timzim View Post
    Light passing through sodium? Have you ever seen sodium? It's a metal. Dunno where you live but on my world light doesn't pass through metals. It tends to stop and bounce off.
    It was actually through sodium atoms - a laser bathed sodium vapour was used in the experiment Slow Light

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    Quote Originally Posted by RabbieBurns View Post
    sodium is salt is it not?
    No. That's sodium chloride.

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    Quote Originally Posted by Domino View Post
    Ah, the Bose-Einstein condensate...silly me...

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    Quote Originally Posted by timzim View Post
    Ah, the Bose-Einstein condensate...silly me...
    can't believe you forgot about the bose-einstein condensate. how stupid must you feel right now.......

  6. #111

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    indeed!!

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    Fact #39: There were seven sheep on Noah's Ark, because there were seven of every type of clean animal onboard the Ark, with two of each unclean animal like pigs. (religious definitions, not mine)

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    how can something that is a myth be a fact? :P

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    In the morning I'll post another fact then :-p

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    Seeing as fact#39 has been dismissed as not true...

    Fact #39: Cracking knuckles does not cause arthritis. A science experiment was performed on 100 people over 60 years where one hand had cracked knuckles, the other didn't. Both hands were examined and seemed equal for the potential for arthritis; cracking caused no noticeable damage.
    Last edited by nephilim; 15th February 2011 at 09:34 AM. Reason: re-edited the fact number

  11. #116

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    Quote Originally Posted by nephilim View Post
    Seeing as fact#39 has been dismissed as not true...

    Fact #40: Cracking knuckles does not cause arthritis. A science experiment was performed over 60 years where one hand had cracked knuckles, the other didn't. Both hands were examined and seemed equal for the potential for arthritis; cracking caused no noticeable damage.
    A single study with a single pair of hands does not mean a useful conclusion to me... If they'd done it with 1000 pairs of hands over those years, then that would be statistically significant.

  12. #117

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    I miswrote that...i'll edit the post

  13. #118

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    Quote Originally Posted by timzim View Post
    Light passing through sodium? Have you ever seen sodium? It's a metal. Dunno where you live but on my world light doesn't pass through metals. It tends to stop and bounce off.
    Quote Originally Posted by Domino View Post
    It was actually through sodium atoms - a laser bathed sodium vapour was used in the experiment Slow Light
    Quote Originally Posted by timzim View Post
    Ah, the Bose-Einstein condensate...silly me...
    Well, there is the possibility of quantum mechanical tunnelling, which would allow, under certain circumstances, light to pass through a solid. And you don't need to bother with super-cooling.

    A fun experiment to try at home is just to shine an led torch under your thumb, and see your nail light up red. Not quite the same thing, and it defo wont be much slower, but clever all the same.

    Quote Originally Posted by RabbieBurns View Post
    how can something that is a myth be a fact? :P
    Second that notion.

    Quote Originally Posted by nephilim View Post
    Seeing as fact#39 has been dismissed as not true...

    Fact #40: Cracking knuckles does not cause arthritis. A science experiment was performed on 100 people over 60 years where one hand had cracked knuckles, the other didn't. Both hands were examined and seemed equal for the potential for arthritis; cracking caused no noticeable damage.
    Quote Originally Posted by nephilim View Post
    I miswrote that...i'll edit the post
    Fact #40, should be renumbered #39 else we'll be short a fact

    I get the feeling this thread reads much like the legal department's inbox at Mythbusters, anyone else..?

  14. #119

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    fact number re-edited

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    I can't say i've gone to any great lengths to investigate it, but I believe the reason that when you shine a torch through your thumb/fingers and you can 'see though' them, is due to light reflection and density of materials.

    From what I remember/understand, it works in a similar principle to Optical Fibre, and the red comes from your skin acting as a light filter. Light is bounced off the bones of your finger, and reflected within the layer of skin. Your nail is is a change in density, altering the light reflection patterns and so light escapes in a different amount and pattern.

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