I've been on a YouTube kick lately, and would like some recommendations for your favorite technology/programming/whatever channels. I'm a java developer if that help. Here are some of mine:
https://www.youtube.com/user/GoogleDevelopers
https://www.youtube.com/user/GoogleTalksArchive
https://www.youtube.com/user/AtGoogleTalks
https://www.youtube.com/user/MarakanaTechTV
As you can tell, they're almost all Google talks.
Numberphile is a channel of really pleasant and interesting math videos. It's intended for a general audience; any level can enjoy it.
Perhaps you should show these videos to your kids too? When I was young I thought math was boring. It wasn't until college that I found out it was secretly very interesting.