Littleton Shooting; Lavrov; Greenstock; Remembering Elizabeth Tilberis

Harvard professor Sissela Bok and Jeffrey Fagan of Columbia's Center for Violence Research and Prevention examine the school shooting in Littleton, Colorado, and discuss measures to prevent future incidents. Russia's Ambassador to the U.N. Sergey Lavrov talks about Kosovo and the role his government needs to play in ending ethnic cleansing there. British diplomat Jeremy Greenstock also talks about the ethnic cleansing in Kosovo. In remembrance of Elizabeth Tilberis, a rebroadcast of her appearance from 1998.