A study of genetically identical mice is providing some hints about humans. How can one identical twin be a wallflower while the other is the life of the party?
The study of 40 young mice found that their behavior grew increasingly different over three months, even though the mice shared the same genes and lived in the same five-level cage, researchers report Thursday in the journal Science.
The House Homeland Security Committee held its first hearing on the Boston Marathon bombing and aftermath on Thursday. Witnesses included the Boston police commissioner and former Sen. Joe Lieberman. Panel Chairman Mike McCaul has been highlighting intelligence failures.
President Obama turns his attention back to his economic agenda Thursday when he travels to Austin, Texas, where he will visit a technology high school and a company that makes the machines that make silicon chips.
The White House says the trip is part of Obama's Middle Class Jobs and Opportunity Tour. It also appears to be an effort by the president to get back to the issues Americans care most about.