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http://www.eskimo.com/~billb/feynman.html
I don't recall seeing this go by here. If you're going to be near San
Francisco next saturday, don't miss this! (below)
SCHEDULE OF EVENTS.. . .
======= Freezing stuff in Liquid Nitrogen with Coral Clark ========
Watch what happens to all sorts of materials when you freeze them to a
temperature of -70° Kelvin. Coral Clark, a Teacher-in-Residence at the
Exploratorium, is developing science activities for classroom use by
California teachers.