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It's not just the heat — it's the humidity. Health experts actually apply that principle to workers, soldiers and sportsmen who toil outside and in places that lack air conditioning. A study in Nature Climate Change says that global warming will noticeably reduce the amount of time people can spend working and playing safely outside.

Several big retailers say the return of the full payroll tax is causing consumers to curtail spending, but so far the evidence is mostly anecdotal. Some analysts argue a variety of factors, and not any specific policy, contributed to slower growth in consumer spending in January.

The debate currently raging over guns goes beyond a disagreement over policy. Advocates on both sides literally disagree on the terms of the discussion — as in, the words they use to describe it. They know that the specific phrases they use tap into deeply held values in the people who hear them.

Drone developers in upstate New York and other regions are striving to be named official testing sites for drones as the FAA creates regulations for their use.

Pope Benedict XVI leaves office this week, the second pope to resign voluntarily. The first was Celestine V, a hermit who quit in 1294, after a brief and disastrous stint. Some scholars say Dante damned Celestine as a coward in his Inferno. Yet his example, legally and spiritually, played a major role in Benedict's departure.

Twenty-eight states and the federal government have enacted laws that provide for automatic DNA collection from people at the time of their arrest. The question is whether it is unconstitutional to do that without a warrant, for the sole purpose of checking the DNA against a national crime scene database.

A Maryland building firm automated its home design process, and now it's looking to use another company to assemble houses on-site from parts. The firm has half as many workers as before the recession.

But the Federal Reserve chairman warns Congress that the "sharp, front-loaded spending cuts" that would come with the so-called sequester could hurt the economy. He recommends "policies that reduce the federal deficit more gradually in the near term but more substantially in the longer run."

Many American doctors are nurses are helping to build medical schools abroad, as funding agencies push for this collaborative style of philanthropy. Even former President Clinton is getting involved. He's launched a $15 million initiative to revamp Rwanda's health care system.

The head of the conservative Project on Fair Representation has spent years pursuing legal channels to roll back a key section of the 1965 Voting Rights Act. His efforts helped bring the issue before the U.S. Supreme Court, which hears arguments Wednesday.