Here's my theory on the whole thing:
the hot water cools at a more rapid rate due to it trying to cool the environment around it. the cold water is so close to the freezing point to begin with that it does it slower.
This is much the way our hands get cold handling object during the winter time. Our hands are losing heat by trying to warm the object they are holding. There's a specific term for this but I can't remember it right now.
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