Physics
The direction of heat flow between two objects depends on

Whether they are in solid, liquid or gaseous state
Their heat contents
Their temperatures
Their masses

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Physics
What is a compound microscope?

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

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