An FYI for anyone scratching their heads wondering why anyone would say to put hot water in ice cube trays:
Mpemba Effect On the other hand:
Straight Dope And for a third opinion:
Who KnowsFor "clearer" ice cubes, put the trays inside a freezer bag. I guess it cuts down on freezer gas that clouds them up? Never tried it...
And for some colder ice blocks, freeze salt water. Just don't try to drink it when/if it melts :oops: