Its a very good knowledge gaining channel. There are somany shows on the channel which will give you knowledge of world wide.
All the programs are amazing. Brain games, Air crash investigation, Breakout, Life hacker. Science of stupid, Supercars, etc. Such programs make your mind fresh and keep your brain alert. Such awesome shows make this channel brillant.
So, from now onwards when you have no work then just take you tv remote, go and watch National Geographic Channel.