Physics
For a ray of light to suffer total internal reflection it has to pass from :

Glass to water
Water to glass
Air to water
Air to glass

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Physics
Conservation of energy refers to the fact that

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

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Physics
The mass defect is the result of what action occurring?

Protons and electrons being attracted to each other
Energy being converted into moles of atoms when neutrons break apart protons
Mass being converted to energy when protons and neutrons bind together in a nucleus
Mass being converted to energy when protons and neutrons break apart in a nucleus

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