wikify intro graf

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 # MIT Student Information Processing Board
 
 We are MIT's volunteer student computing group, improving computing at
-MIT since 1969.  Today, SIPB projects provide innovative services and
+MIT since 1969.  Today, [SIPB projects](projects) provide innovative [services](projects) and
 special expertise to the MIT community.  We have an office just
 outside the Athena cluster in the student center W20, and you are
-welcome to come by to ask us for help or to hang around and use our
-computers.
+welcome to come by to [ask us for help](computer_help) or to hang around, use our
+computers, and maybe [get involved](join).
 
 This site is a wiki.  Edit, be bold, start with the [[sandbox]] to play around.