The FBI has arrested a suspect in a case involving the discovery of a pair of letters containing the deadly poison ricin and says investigators are working "around the clock" to address any remaining risks.

A hastily scrawled note by President Abraham Lincoln just two months before his assassination ordering a disabled 14-year-old boy released from the army in response to a plea from the boy’s father went on sale Thursday in Philadelphia.

The Environmental Protection Agency has overestimated the levels of water pollution on poultry farms by as much as half according to a recent study by the University of Delaware.

The Boy Scouts of America's National Council has voted to ease a long-standing ban and allow openly gay boys to be accepted as Scouts.