US vice president Biden has been on a fact-finding tour of laboratories and institutions around the US as he seeks to lead the National Cancer Moonshot. Vice President Joe Biden speaks with Nobel laureate Paul Modrich, left, as Vickers Burdett, wife of Modrich, middle, and A. Eugene Washington, Chancellor for Health Affairs at Duke University, right, listen in a laboratory at Duke University School of Medicine in Durham, North Carolina, on Wednesday, February 10, 2016. Vice President Biden visited Duke to speak about his Cancer Moonshot initiative. (AP Photo/Ben McKeown)