Why does salt dissolve in water?
Where does it go when it is put in water?
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Do trees make rain?
Trees need rain. And make it too.
Invention of the cell
Before the cell could be invented, it had to be discovered.
Metal ages
Chalcolithic Age (5000 BCE to 3000 BCE)
The metal ages started with
Stone ages
The stone ages (no, this is not the time we were all