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Hans Christian Ørsted (or Oersted) lived in Denmark. He discovered the magnetic field produced by an electric current.
Aluminium was discovered by Hans Christian Ørsted, in 1825, in Denmark.
In 1820, Hans Christian Oersted (1777-1851) proved electric current can affect a compass needle. However,Oersted could not explain why.
Hans Christian Andersen used the pen name "Hans Christian".