From NPR:

Television’s “Mr. Wizard,” Don Herbert, who taught generations of children about science, died at his Southern California home Tuesday. He was 89.

From 1951 through 1964, Watch Mr. Wizard delighted young viewers with the joys of science on a set built like a simple workshop. Herbert would demonstrate experiments using household items and encourage kids to “try this at home.”

Herbert received a Peabody Award for the science show in 1954.

Watch Mr. Wizard was briefly revived in the 1970s and then again in the 1980s, after Herbert retooled the show with a faster pace for the Nickelodeon channel.