We have generated museum revenue by selling copies of casts
          from molds developed for our exhibit halls, copies of our
          Planetarium shows, penguins raised by the Aquarium staff,
          copies of CD-ROMs of interactives produced for our
          exhibtions, pendulums made by our staff and by having our
          staff serve as paid consultants on outside projects that
          fit within our mission.

          Linda Kulik
          Exhibits Chair
          California Academy of Sciences
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