The difference between "them" and "those" is that 'them' is an objective pronoun whereas 'those' is a demonstrative pronoun.
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The different between sag and surges
You would have to ask those "different scientists"
The word "different" in the sentence has 14 characters on each side of the word. So "different" is the one thing that is different between the two.
Different liquids are made up of different types of molecules, which have different masses, different forces between them, etc.
Nothing.