I think most people my age remember at least one thing they learned from Don "Mr. Wizard" Herbert, who died today.
I remember when he waved a pencil in front of a TV screen. You could see the flicker of the screen's refresh rate. Sometimes I still do this when I am really, really bored.
Godspeed, Mr. Wizard. You made me think science was cool, and pushed me along the path to nerddom. Which I'm okay with now. Mostly.