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

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

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Physics
Ice is packed in saw dust because

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

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