It's been over 40 years since the crisis unfolded at Three Mile Island. But the nuclear accident still lingers with us today, as the United States confronts new public health emergencies. At the time of the accident, Peter Bradford was a member of the Nuclear Regulatory Commission. He joins Lindsay to discuss what went wrong at Three Mile Island; who was responsible for the crisis; and how nuclear power could play a larger role in the future, as the world looks to fight climate change.