Can U.S. learn from Australia's hybrid health care system?

The U.S. has the world's most expensive health care system, but it leaves roughly 30 million people uninsured. As policymakers consider making changes, some are looking to Australia as a model. That nation has achieved universal health coverage at a lower cost, using a successful mix of public and private systems. William Brangham reports for our series "The Best Health Care? America & the World."