An opening reception (heavy hors doeuvres plus cash bar) and registration will be held at the Boston Museum of Science on Sunday, July 27, beginning at 6:00 p.m. Round-trip bus transportation beginning at 5:45 p.m. will be provided from the Marriott Hotel and the MIT campus. Preregister and plan to arrive early so that you can have time to participate in an exlusive showing from 7:00 to 8:00 p.m. of a widely acclaimed exhibit featuring drawings and models by Leonardo Da Vinci. (Boston is the only U.S. destination for this international exhibit.) Registration will close at 9:00 p.m. The reception will continue after the showing until 10:00 p.m. The last bus will leave the Museum at 10:15.