Researcher Sabine Szunerits, Professor in Chemistry at the University Lille 1, surrounded Rabah Boukherroub, Research Director Group Leader at the Institute of Electronics, Microelectronics and Nanotechnology at the University of Lille, and Professor David Devos, displays a smartphone showing curve indicating a COVID-19 test positive result during an interview with Reuters about a project called CorDial-1 for rapid COVID tests via smartphones, at the CNRS in Villeneuve-d'Ascq, France, February 11, 2021. Picture taken February 11, 2021. REUTERS/Pascal Rossignol