A chain reaction is a self-propagating reaction that continues without additional outside assistance once it is started. Like a series of dominoes falling in regular succession after the first is toppled, chain reactions proceed by themselves once...

The minimum quantity needed to produce an effect. The term is used in relation to nuclear physics to describe the minimum amount of fissionable material that is necessary to sustain a nuclear chain reaction at a constant...

Critical Mass is an event typically held on the last Friday of every month in cities around the world where bicyclists and, less frequently, unicyclists, skateboarders, inline skaters, roller skaters and other self-propelled commuters take to the...

First Green Bay turned its back on the river, then on the past. "But the past is the past, and right now the future is looking very exciting," says Denis Hogan, president of Associated Bank, a downtown Green Bay fixture for 131 years. ...

The White House was getting nervous. It had told the American people that it was invading Iraq to destroy its weapons of mass destruction. The Americans didn't find any, so they called in "Spike" Valley, the CIA's expert on mass destruction, to give...

A federal appeals court on Tuesday upheld the dismissal of a lawsuit filed by immigrants arrested in a factory raid, saying their constitutional rights were not violated — though it noted that government bungling allowed children of some detainees to go unsupervised.The March raid at...

Reverend Billy says he wants the New York Police Department to get right with the Constitution.The performance artist _ a cross between a street-corner preacher and an Elvis impersonator (but blond) _ was arrested on harassment charges last week while reciting the First Amendment through...