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How We Smell

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining how the sense of smell works, and how we identify aromas.

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Oh hello. Hi Bianca. Hi this is Jacob and Matthew. We're trying to solve a stink problem for KSNN. 00:00:00
So are you the treehouse detectives? That's us. We want to know why we smell certain things. 00:00:12
Or how our noses work. With more information we might be able to sniff at the problem. 00:00:19
Everything that smells or has an aroma has microscopic molecules or little particles that come off and drift into the air. 00:00:26
Once it gets into the air it comes in contact with the nose, it goes inside the nose and then to a very special place 00:00:37
that's set up just to help you understand what the smell is. 00:00:45
But how does your brain recognize different smells? 00:00:50
Depending upon the kind of molecules that come into the nose, the brain will understand what is going on with the smell. 00:00:53
Now for example, pizza may have five little places in the nose for its identification. 00:01:01
Whereas perfume may have six or seven and each of those places is very different. 00:01:09
Do all of us smell the same thing? 00:01:15
Well we do not know if everybody smells the same smells. 00:01:18
What we do know is that people can identify things the same. 00:01:22
Now for example, two children walking into the kitchen may smell something cooking on the stove. 00:01:27
And we'll know right away for example that their mother is making hot dogs. 00:01:34
Now what can change that is if one of the children came from the garage 00:01:39
and had just been watching their daddy cleaning a paintbrush with turpentine 00:01:43
and all that turpentine smell was in the nose. 00:01:47
That would change how that person smells. 00:01:50
I have some questions. What about dogs or other animals? 00:01:52
Do they have the same nose as we do for sniffing? 00:01:56
The same nose! 00:01:59
Well that's a good question. 00:02:02
You've heard the saying, you've got a nose like a shark. 00:02:04
Yes. 00:02:07
I have a friend you may want to visit at the Virginia Marine Science Museum. 00:02:09
To check out sharks, we'll make the time. 00:02:13
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
309
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 17″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
13.78 MBytes

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