During the last episode of "Mr. Wizard's World," Don Herbert was demonstrating the chemical reaction between baking soda and vinegar when the experiment went fatally awry. That's when the madness kicked in, resulting explosion left by the studio in complete ruin, and the surviving crew was thankful to be sane. Due to the intensity of the flames, Don Herbert's remains could not be ascertained from the ashes, though eye-witness accounts clearly indicate his tattered sweater burning in the fiery rubble. Although an extensive analysis of the debris yielded no clues as to the fate of Don Herbert, it was solemnly accepted that he perished that day.