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If you, like me, are about to hold a pre­sen­ta­tion and you’re writ­ing this pre­sen­ta­tion in LaTex (with beamer), and you want to change the para­graph spac­ing (or the so called inter­line), all you have to do is to put this line some­where in your document:

\setlength{\parskip}{10pt plus 1pt minus 1pt}

and after this line, all the para­graph will have the chosen inter­line (of course, you need to adjust the para­me­ters accord­ing to your needs).