Physics
Second and third class levers are differentiated by

The presence of multiple loads
The location of the load
The location of the fulcrum
The type of fulcrum present

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Physics
Lightning is produced when

Strong opposite charges in different clouds break down the resistance offered by the intervening air
Similar charges of electricity rush towards each other and then get repelled
Clouds strike against impurities in air and the friction burns up these impurities
Water vapour produces electricity in the clouds

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