Garik Israelian is a spectroscopist, studying the spectrum emitted by a star to figure out what it's made of and how it might behave.
Pink Floyd fans will appreciate his reference to Dark Side of the Moon: "The power of spectroscopy was actually realized by Pink Floyd already in 1973. Because they actually said that you can get any color you like in a spectrum. And all you need is time and money to make your spectrograph. "
Other TED Talks
The title says it all: this blog features physics videos found everywhere on the web: animations, demonstrations, lectures, documentaries.