Republican presidential hopeful Mitt Romney and U.S. Sen. Scott Brown publicly support each other and even share key advisers. But on many topics, from foreign policy to social issues, the Massachusetts Republicans take very different positions.

Massachusetts Republicans Mitt Romney and Scott Brown have a history of supporting each other throughout their political careers.

New Hampshire's Dartmouth-Hitchcock Medical Center is changing the way it handles knee replacement surgeries based on the results of a data-sharing project aimed at improving health care quality and lowering costs.