I don't know if you remember the show, but when I was a kid I never missed Mr. Wizard. It survived long enough to have a version on Nickelodian called "Mr. Wizards World".  Mr. Wizard was very smart with tons of information, but he did come across as a bit arrogant and sometimes downright mean to the kids. Watch the video for some of the "low-lights".

In those days it would have been considered tough love, today it might be considered abusive. In today's world it might turn off anybody really interested in science. Although, taking another look back at this super-cut of clips, we can’t help but get that feeling that maybe Mr. Wizard was a 'meanie" in real life.