Here are some videos and websites to help us learn more about magnets.
Compass and magnet
Difference between magnetic and non-magnetic materials
https://youtu.be/UhfcyQwD4PY
Uses of electric magnets
https://youtu.be/B8d-Nb58IqY
Characteristics of magnets
http://www.howmagnetswork.com/
Electromagnet
http://science.howstuffworks.com/electromagnet.htm
How an electric bell works
https://gridclub.com/subscribers/info/fact_gadget_2009/1001/science_and_technology/electricity_and_magnetism/877.html
How to make electromagnet stronger
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