I thought it might be valuable to have a list of non-existent channels that new rubies could raid for ideas in case they have no channel ideas of their own, or their channels proposals have already been shot down for one reason or another.

Don't submit channel ideas that you intend to use yourself. The whole point of this list is for them to be taken and used by other people. Here's a handful to prime the pumps. I'll try to update the post with suggestions from the comments as time allows.

• 60s, 70s, 90s, etc
• africa
• arabia
• buddhism
• breakthrough
• china
• debate
• europe
• exercise
• fallacy
• fantasy
• fight
• germany
• godwin
• gross
• hinduism
• horrible/tragic (for all those things that get put in *terrible that don't belong there)
• india
• martialarts
• math
• paranormal (ghosts, aliens, cryptozoology, etc)
• photography
• physics
• protests
• psychedelic
• sad
• skepticism
• skillful (http://videosift.com/talk/Channel-idea-Skillful)
• speed
• technology
• trailers