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Footnotes in PowerPoint are helpful for adding attribution or sources to facts. To add them, type a number, highlight it, click on the arrow below the font section, select superscript, then press ok. This gives the text the style commonly used for annotations. Insert a new text box at the bottom, type the number and the source of attribution, then apply the superscript option to make it clear that it is the reference. This helps the audience know the source of the fact and find more details if needed.