Easily the BEST site available for covering topics in Biology. If you don't understand a topic - this is the site for you. This site is put together by a Biology Teacher in Montana. It contains short video podcasts on hundreds of different topics. Most of the videos relate to Biology. However, there are also many good podcasts on Chemistry, Physics, Math and other science, technology and education topics. Each one is about 10-15 minutes and covers a topic very thoroughly and in a way that is easy to understand.
This is a companion site to the Miller/Levine Biology Textbook. A wide range of articles, videos, explanations and expansions. A good supplement to Chapter Mysteries or expanding on concepts from the text.
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Khan Academy has great tutorials on a huge variety of topics. The tutorials are especially good for Math and Science, however, they also have many on history, economics, politics, art and other topics. Each tutorial is about 10-15 minutes long and focuses on one, specific concept.
TED - Technology, Entertainment and Design. TED conducts multiple annual conferences that bring together some of the most forward thinking people in the world. The conferences consist of dozens of short 10-20 minute presentation on a wide range of topics - often centered around a central theme. This website has all of the "TED Talks." Many center on science and technology. They range from informative, to controversial, to inspiring. Check them out and search for ideas and topics that might interest you.
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