grandma was wrong. Hot water dropps in temperature faster, because it has farther to go. it does not freeze faster. The Water must go thru several phases. as it get's colder, it dropps to the bottom of the container, then when it freezes it becomes less dense (expands)and rises to the top and crystalizes. the loss of heat is the loss of energy. the loss of energy is going to be greater in a body that has more energy. but a body of water with less energy is going to achieve a state of "frozen" faster than one with higher energy....provided all other factors are the same.

David