Physics
Skating on ice is possible because

Ice is cold
The surface of ice is smooth
The pressure on the ice due to skate raises its melting point
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

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Physics
Which of the following occurred first ?

Guglielmo Marconi sent out the first wireless signals
Max Planck unveiled the Quantum Theory
Wright Brothers successfully flew an aircraft
Albert Einstein propounded the General Theory of Relativity

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