Date: Thu, 04 Dec 2003 09:01:45 -0600

Author: "Thomas J Senior"

Subject: Re: lunar atmosphere



On a recent edition of "Nova," one of their scientists suggested
that the atmosphere of Mars was reduced because Mars lost its magnetic
field when its interior cooled. The solar wind then eroded the
atmosphere to its present level.
So along with the moon's low escape velocity, it has no pretective
magnetosphere to preserve an atmosphere.


Thomas J. Senior
New Trier High School
385 Winnetka Ave
Winnetka, IL 60093-4295
From Thu Dec 4 10:31:12 2003
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From: "kmatsler matsler"
Subject: RE: seeing colors
Date: Thu, 04 Dec 2003 09:31:03 -0600
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The book is great! I have a kindergarten friend who actually introduced me
to that book. I use it in class for all levels and they love it....
Karen Jo

>From: "Dick Heckathorn"
>Subject: RE: seeing colors
>Date: Tue, 2 Dec 2003 22:33:08 -0500
>If you try it in a room with light, it will work. In a dark room, I
>could never see the after image.
>My understanding is that if you look at a red image, the red cone
>receptors are working, sending the information to your brain. The green
>and blue cones are not doing anything if there is no green or blue.
>When you stare at a white page, the reflected white light activates all
>three color cone receptors. The green and blue cone receptors have not
>been "working" and thus are more efficient in transmitting what they
>detect while the red cone receptor does not do its normal part.
>Combining green and blue one gets cyan, the afterimage color seen.
>There is an outstanding book dealing with after image called "Hello Red
>Fox" for about $6.00. Just got one last week.
>"Science is nothing more than learning how to communicate with nature in
>such a manner that it will talk back."
>Helping teachers who facilitate, motivating students who learn.
>Dick Heckathorn 14665 Pawnee Trail Middleburg Hts, OH 44130
>Physics Teacher CVCA 4687 Wyoga Rd Cuyahoga Falls, OH 44224
>330-929-0575 VM 120
>-----Original Message-----
>[] On Behalf Of Anthony Lapinski
>Sent: Tuesday, December 02, 2003 3:43 PM
>Subject: seeing colors
>A bio teacher here wanted to know why is it when you stare at a red
>for 30 s and then look away, you see an image of the circle in its
>complimentary color. I know (think?) there are three types of rods/cones
>on the retina, each being sensitive to a different color. Starring
>them to "tire," but why the complimentary-colored afterimage?

Winterize your home with tips from MSN House & Home.
From Thu Dec 4 10:41:31 2003