James Bjorken, 90, Dies; Physicist Who Helped Prove That Quarks Exist

Murray Gell-Mann on some of Bjorken's contributions.

https://www.youtube.com/watch?v=Mlk5OlaUtuQ

https://www.youtube.com/watch?v=bw9lytHrW-Q

https://www.youtube.com/watch?v=5PH4H29g_wQ