Two district courts uphold insurance mandate, but two other courts find it unconstitutional.
Mine safety regulator proposes criteria for improving worker protection.
Funding shortfalls may inhibit efforts at improving mine safety.
Government takes steps to protect consumers from poisonous substances in homes.
Studies question whether nutrition disclosure laws are effective in reducing calorie intake.
Agency seeks to change requirements for manufacturers to disclose information about hazardous materials.
President Obama faces major tradeoff in achieving promised health reform.