Physics
Conservation of energy refers to the fact that

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

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Physics
What is a compound microscope?

A microscope whose lenses are concave.
A microscope that has one lens.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are convex.

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