An Australian technologist has caused a global stir after discovering Facebook tracks the websites its users visit even when they are logged out of the social networking site. Separately, Facebook’s new Timeline feature, launched last week, has been inadvertently accessed by users early, revealing a feature that allows people to see who removed them from their friends’ lists. Facebook’s... 

Officials in protective gear near the Fukushima Daiichi nuclear plant, in Koriyama, March 13, 2011. An American nuclear expert says radiation from Japan could spread across the Pacific and reach the United States if a complete meltdown occurs at a Japanese nuclear facility damaged as a result of last week’s earthquake and subsequent tsunami. Nuclear expert Joseph Cirincione of the Ploughshares Fund...