The Houston area produces about a quarter of the nation's gasoline, and about a third of the plastics that are in our cars, cupboards and just about everywhere else. So it is no surprise that this heavily industrial area has a problem with air pollution. But in the past decade, Houston's air has improved dramatically.
How that happened is a tale of good science, new technology and a Texas law that prompted companies along the Houston Ship Channel to disclose their emissions.
Police in New York say preliminary tests of two threatening letters sent to Mayor Michael Bloomberg contained traces of ricin.
The anonymous letters, both addressed to Bloomberg, were opened Friday in New York at the city's mail facility and Sunday in Washington, D.C., at the headquarters of the nonprofit started by Bloomberg, Mayors Against Illegal Guns, according to authorities.
Minnesota Rep. Michele Bachmann's announcement Wednesday that she won't seek a fifth term unleashed a torrent of tweets and blog posts on the left lampooning the short-lived 2012 presidential candidate.
Yet the response — her retirement effectively dominated the news cycle — provided a glimpse of Bachmann's impact on Washington.