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A bias toward using male lab animals and tissue samples from males may be limiting the effectiveness of medical research, according to top officials at NIH. They'll roll out new guidelines this fall.

Voters in Brazil go to the polls Sunday to choose a new president. Incumbent Dilma Roussef is up against environmentalist Marina Silva and others, in a nail-biting race.

The actions stem from a scandal over cheating on proficiency exams at the 341st Missile Wing at Malmstrom Air Force Base in Montana.

Citing millions of dollars spent already, Democrats argue politics is not a good reason to spend millions more investigating the attack on the U.S. diplomatic outpost in Libya more than a year ago.

An IPO filing provides a window into wealth. In the case of Facebook, the wealth will likely be enormous and spread across hundreds if not thousands of early investors and employees. The number of millionaires and billionaires in Silicon Valley grew noticeably Wednesday.

A niche industry of tour companies is taking people into wolves' habitat at Yellowstone National Park. Montana Public Radio's Dan Boyce went on an expedition with a man who recognizes the problems wolves bring to the landscape even as he makes his living off of them.

The fire killed at least 356 people and now human rights groups are calling for Honduras to reform its prison system.

Teachers and school districts say they agree better teacher evaluations are needed, but they can't agree on the details. Disputes in Hawaii and New York could lead to revocation of lucrative federal grants and also force the Department of Education to take aggressive action.

People searching online for information on prescription drugs have a 1 in 3 chance in being secretly hijacked to an online pharmacy instead, according to new research. Legitimate health information sites are being crowded out of search results by these search-redirection attacks.

As he retires and heads into the private sector, Shawn Henry looks back at the growth in the cybercrime problem.