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Years ago I needed some ice for an experiment the following day in Physics
class. I placed some water in a standard ice cube tray (back then it was
aluminum with a removeable aluminum divider) and left for the day. The next
morning I opened the freezer compartment of the refrigerator and pulled out
the tray. To my disappointment, the water did not freeze. I decided to pour
it down a drain on the other side of the room. As I walked across the room I
happened to look at the tray and I thought I saw something moving in the
water. It was then I realized that it had supercooled and I was watching the
crystallization of the water. How many times in a lifetime does one see that
by accident?