Overview of Benjamin Franklin's Life
During this eight-minute video, Sal Khan and a guest speaker discuss Ben Franklin's life. (08:12)
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Lower Intermediate S6 #5 - Japanese Calculations and Good Conversation
Learn Japanese with JapanesePod101.com! A trip to the gym in Japan isn’t in the cards for you today: you just got your workout by lifting box after box of heavy produce at the Japanese greengrocer. You pause to add up the various weights you’ve lifted, and your calculations come to more than a thousand pounds! [...]
Author(s): JapanesePod101.com

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Light : particle or wave?
This is a detailed explanation of the dual nature of light, complete with clear, labeled line drawings and Java interactive tutorials.
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Lectures on the Standard Model of Particle Physics

Professor Harald Fritzsch