Paramagnetisim and Diamagnetism

Hello. This is Menbo.
I'm getting used to stay home, and enjoying this life style.

This time, the theme of this video↓ is magnetism.
I think everyone once thought why N and S are attracted each other and the same poles are repulsed.
This vedio doesn't give the answer to this basic question, and honestly, I have no confidence to explain this to everyone and make theirselves understood.
Apart from a difficult theory, let's watch an interesting phenomenon. 

Paramagnetism and Diamagnetism

In this video, we can watch reactions of materials which is exposed to the external magnetic field.
Resercher devided types of reactions into two groups, Paramagnetism and Diamagnetism. The former is usual for us, but the latter is unusual for us.
Materials behave as N pole to N pole, and S pole to S pole , and then generate 
repulsive forces. Really interesting!!
This origin is Diamagnetisim and this is fundamentary from paired electrons.

If you are interested in Diamagnetism, please check this pdf↓.
http://e.sci.osaka-cu.ac.jp/yoshino/edu/water/chapter04.pdf


So much for today. Thank you.