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
Inhomogeneous and transparent
Homogeneous and transparent

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Physics
What is a neuron ?

Basic unit of energy
Basic unit of nervous system
The anti-particle of neutron
Particle released during radioactivity

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