Physics
Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is

Inhomogeneous and transparent
Made up of slabs of different refractive indices
Homogeneous and transparent
Of variable refractive index

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Physics
Absolute Zero is defined as

At which liquid Helium boils
At which water boils at 298K
At which the volume becomes zero
The temperature at which all molecular motion ceases

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