Physics
The term ''equinox' means

The axis of the Earth around which it rotates
When the day and night are of equal duration
The path which the Earthtakes around the Sun
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

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Physics
What is a neuron ?

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

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