Some time back, I got a letter
from a high school student who
wanted to salvage old winter
coats as a science project.
I wrote back and made a suggestion.
I'm not sure that my suggestion
was all that good, quite frankly.
However here is what the student
wrote and here is how I replied:
How Does Insulation Work?
Perhaps someone out there has
a better idea than mine. Maybe
I should have suggested needle
and thread and left it at that.
It's not always clear to me what
the right trade-off is between the
pursuit of an ideal and practical
do-ability.
Ed Abbott
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