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We use a Graham Cracker because it's dry.  That way, the LN2 can hide in all
the spaces of the cracker and become immediately gaseous when it hits the
heat of the mouth.  Foods that hold more moisture could give the inside of
the mouth a freeze burn.  (we had a misguided demonstrator try this with a
peach many years ago.  It was...a mistake).

So, folks, we've heard about the variety of foods that people stick in LN2
then eat.  We've done cross-cultural culinary education.

I'm still looking for info from those of you who share LN2 frozen snacks
with the public.  I'd love to go back to my safety officer and tell her that
there are a dozen other reputable museums who do this, and how they keep the
public safe.

Some of our safety procedures on this:  Be sure the parents are present (for
minors).  Have them swallow their saliva.  Shake off the food before passing
it out.

Thanks for reading through my last-ditch effort...

Beth

> Beth Amsbary
> Floor Presentations Supervisor
> Pacific Science Center
>
> (206)443-2385
> [log in to unmask]
>
> Get ready for lift off!  The world premiere of SPACE: A Journey to Our
> Future is coming November 22, 2003.  In an immersive exhibit experience,
> SPACE celebrates the past, present and the future of space exploration and
> discovery.  For more information visit www.spaceexhibit.com.
>
>



> ----------
> From:         Kyle Doane
> Reply To:     Informal Science Education Network
> Sent:         Wednesday, October 8, 2003 11:53 PM
> To:   [log in to unmask]
> Subject:      Re: LN2 Graham Crackers.eml
>
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
> **************************************************************************
> ***
>
> Glen,
>
> I do love learning new things.  That is the best bonus of this work. I
> am not sure why the Graham cracker is chosen for the demo over others.
> Perhaps it is porous, but keeps its shape when soaked.  (a very good
> cracker for dipping in milk).  Perhaps a baby teething cracker would
> have similar characteristics?
>
> Kyle Doane
> Origins Curriculum Development
> Pacific Science Center
> Seattle, WA
>
> 206-443-2910
>
> [log in to unmask]
>
>
> From: Glen Moore
> Science Centre and Planetarium
> Wollongong, Australia
>
> "Thanks, Kyle!!
>
> I have been educated this week about something I knew nothing
> about, last week - sounds suitable for a Vegemite spread but I
> feel the need to find something similar for the n2 demo.
>
> (BTW Have to admit that I hate vegemite even though it is Aussie
> traditional <smile>)
>
> best regards
> Glen
>
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