Sub BumpTheSubsAndSupers()

Dim oSl As Slide
Dim oSh As Shape
Dim x As Long
Dim dBumpBy As Double

dBumpBy = 4 ' number of points to bump sub/superscript by
' Check each slide
For Each oSl In ActivePresentation.Slides
  ' Check each shape on the slide
  For Each oSh In oSl.Shapes
    ' Make sure it's got text
    If oSh.HasTextFrame Then
      If oSh.TextFrame.HasText Then
        With oSh.TextFrame.TextRange
          For x = 1 To .Runs.Count
            If .Runs(x).Characters.Font.BaselineOffset <> 0 Then
            ' it's a sub/super; make it four points
            ' bigger than the text immediately prior:
            .Runs(x).Characters.Font.Size = _
               .Runs(x - 1).Characters.Font.Size + dBumpBy
        End If  ' it's a sub/superscript
      Next x
    End With    ' textframe.textrange
      End If    '  .HasText
    End If  '  .HasTextFrame
  Next oSh      '
Next oSl

End Sub