bean seeds & mold?

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From: Kelly Vaughan (kvaughan@mh3.echalk.com)
Date: Tue Apr 12 2005 - 06:26:58 PDT 

Message-ID: <8110-220054212132658531@mh3.echalk.com>
From: "Kelly Vaughan" <kvaughan@mh3.echalk.com>
Subject: bean seeds & mold?
Date: Tue, 12 Apr 2005 09:26:58 -0400

My classes germinated bean seeds in baggies
with moist paper towel. Some worked really well, but others grew only
mold! Anyone found any ways of preventing this? I looked but couldn't
see any strong relationship between whether the bags had been sealed or
left open or any other variables.

thanks,
Kelly

--- Original Message ----
From: pinhole@exploratorium.edu
To: pinhole@exploratorium.edu
Subject: RE: Pinhole Digest #1725 - 04/12/05
Sent: Tuesday, April 12, 2005 3:20:01 AM EDT

Pinhole Digest #1725 - Tuesday, April 12, 2005

  Subject: freeing stuck glass stopper
          by "Jeff Furman" <jfurman@ocs.net>
  Color in the eye
          by <Cbdirtball@aol.com>

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Subject: Subject: freeing stuck glass stopper
From: "Jeff Furman" <jfurman@ocs.net>
Date: Mon, 11 Apr 2005 00:35:45 -0700 (PDT)

Geoff, I will guess you want the stopper colder than the surrounding
bottle, just the reverse of your efforts. I vaguely recall that solids
generally expand as the temperature increases; ice is an exception to this
rule, however glass follows the rule.

Jeff Furman

----------------------------------------------------------------------

Subject: Color in the eye
From: <Cbdirtball@aol.com>
Date: Tue, 12 Apr 2005 00:49:51 EDT

My colleague and I had a question about light mixing....for example we all
learn that red added to blue produces magenta. The question is:

    is it constructive/destructive interference that creates the new
color?
    is it the human perception of the two individual waves together that
produces the magenta?
    is it solely a perception issue?

Is the magenta a new single wave, so to speak or do the two waves excite
the rods and cones in a way that we perceive magenta?

Thanks,
Charlie Bissell
Craig Childress
Hillsdale High School
San Mateo, California

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