What activities do Michael Goodrich and Gerald Masson participate in?
SELECT actid FROM Faculty_Participates_in as T1 join Faculty as T2 on T1.Facid  =  T2.Facid where T2.Lname = "Goodrich" and T2.Fname = "Michael" UNION SELECT actid FROM Faculty_Participates_in as T1 join Faculty as T2 on T1.Facid  =  T2.Facid where T2.Lname = "Masson" and T2.Fname = "Gerald"
activities participated by individuals = actid; participation data is linked between Faculty_Participates_in and Faculty tables; UNION is used to combine results for both Michael Goodrich and Gerald Masson without duplicates;