Physics
What is a neuron ?

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

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the sand is grainy but concrete is smooth.
the friction between sand and feet is more than that between concrete and feet.
the friction between sand and feet is less than that between concrete and feet.

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