Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust will not get melted easily.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.

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Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired

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