TED Talks
Ted: Ted Ed: Ruthenium: Periodic Table of Videos
The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one element, ruthenium, has a rather special place in the heart of Professor Martyn Poliakoff. [6:00]
Khan Academy
Khan Academy: Us History: Period 9: 1980 Present: The Presidency of Barack Obama
A text tutorial over US President Barack Obama's American presidency.