The New York Police Department and Brookhaven National Lab are releasing "low concentrations of harmless gases" into the city's subway system this summer to study how airborne contaminants spread.
The Tsarnaev brothers may have learned how to make bombs from an English-language magazine published by Al Qaeda in the Arabian Peninsula, according to law enforcement authorities.
Dzhokhar Tsarnaev, who was seized on Friday night, is now conscious. The 19-year-old is responding to investigators in writing, as he is unable to speak because of a throat wound.
Edward Davis says that the identification system used by the city "came up empty." The breakthrough came as a result of a mixture of citizen journalism, police legwork, and technology--one agent watched the same video clip 400 times.
Reddit's users launched a new subreddit, Findbostonbombers, where hundreds of amateur sleuths are crowdsourcing clues and suspects in the Boston terrorist attack.
When terrorists attack, mobile phone networks fail. They also go down during natural disasters, and even at big sporting events. Here's what causes network overload and what we can do about it.
After seeing the IEDs used in Afghanistan, India, Nepal, and Pakistan, the Department of Homeland Security warned in 2004 and 2010 that they could come here.
As well as warring neighbors using the devices to spy on each other, the technology might fall into the hands of terrorists, said the Google chairman. "It's one thing for governments, who have some legitimacy in what they're doing, but have other people doing it... it's not going to happen."
