will or will ever
explain the difference please
Scientists say it is quite unlikely a person will ever need such cells.
or
Scientists say it is quite unlikely a person will need such cells.

Question

will or will ever 
explain the difference please
Scientists say it is quite unlikely a person will ever need such cells.
or
Scientists say it is quite unlikely a person will  need such cells.

Answer

The word 'ever' serves as an intensifier, the person will never need such cells.