The Department of Health and Human Services has awarded $55.5 million in grants to help bolster a health-care workforce that is stretched thin and possibly due for more strain under the Affordable Care Act. The health legislation, known as Obamacare, requires the uninsured to obtain medical coverage, potentially placing more stress on the nation's health-care network. In a statement on Thursday, HHS said the new round of funding would grow the size of the medical workforce in "a wide spectrum" of fields.