Apparatus:
2
metal
pucks
with
handles,
water,
shop
towel
Description:
The
pucks
have
been
machined
such
that
their
surfaces
fit
together
perfectly.
Placing
the
pucks
face
to
face
and
pulling
them
apart
is
easy.
Adding
a
drop
of
water
to
one
of
the
surfaces
and
repeating
results
in
a
much
different
outcome.
PIRA 2A10.35