U.S. orders university to halt research
A volunteer's death prompts the action over Johns Hopkins' studies of humans.
Government to expand tire recall
Bridgestone/Firestone says the order isn't warranted and will fight it in court.
Groups may sue EPA on water rules
Eight environmental groups notified the U.S. Environmental Protection Agency on Thursday that they will sue EPA unless it reverses its approval of Florida's new rules on polluted waterways.
National headlines
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