I really like the TED talks and often end up spending hours watching random videos that are really interesting.
One of my favorites:
Quote:
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When he was just 14 years old, Malawian inventor William Kamkwamba built his family an electricity-generating windmill from spare parts, working from rough plans he found in a library book.
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He's actually done TED twice. The first appearance was more of an interview because his english wasn't so hot. The second video has him doing the presentation himself.
only 4 min long