For Caltech’s 104th commencement, June 12, 1998, a hot, sunny day quickly turned overcast and delivered a downpour during the second half of the ceremony. Speaker Bill Nye (the “Science Guy”) gave the address, “Hold On to Your Passion, Keep Your Head,” which could more aptly have been titled, “Hold On to Your Umbrella, Keep Your Head Dry.” This was also the first commencement presided over by President David Baltimore.