Magnetism is a force that acts between certain objects called magnets. It is an important force in nature. Electromagnets were invented by an English electrician named William Sturgeion in 1825 A.D .
Alfred Nobel of Sweden invented dynamite in 1897. Dynamite is today used widely for various kinds of explosions. It is particularly useful in mining the industry. Dynamite explosions are used to access mineral deposits deep below the surface of the earth.
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