Well interest in documentaries could be varied by your personal domain of interest. Since you've not mentioned any particular domain, I'll give you a list of the ones I think were great.
1. Century of Self
2. BBC Horizon Infinity and Beyond
3. BBC Horizon Is Seeing Believing
4. BBC Dangerous Knowledge
5. The Shadow Factory
6. Get Lamp
7. Human Experience
Hacker Cinema
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Well interest in documentaries could be varied by your personal domain of interest. Since you've not mentioned any particular domain, I'll give you a list of the ones I think were great.
1. Century of Self 2. BBC Horizon Infinity and Beyond 3. BBC Horizon Is Seeing Believing 4. BBC Dangerous Knowledge 5. The Shadow Factory 6. Get Lamp 7. Human Experience
Hope that helps.