Joining Cool Science Radio is Tanya Lewis, health and medicine editor at Scientific American. Lewis has followed the novel coronvirus story closely and written on it extensively. In December 2019 a cluster of patients was found in Wuhan, China with pneumonia from an unknown cause. While the majority of the cases are in China, the coronavirus has been found in countries all over the world, including the US, where there have been 14 cases reported. Over 3,000 people in China have died from the coronavirus. Lewis recently published an article titled, "Will the New Coronavirus Keep Spreading or Not? You Have to Know One Little Number." That little number is called R-naught - tune in to hear what that means.