As the Earth gets warmer virologist Jean-Michel Claverie's research shows that very old 'zombie viruses' some from almost 50,000 years ago are coming back to life as the frozen ground in Siberia melt. WHO aims to develop a roadmap to prevent or contain an epidemic that can be caused by these pathogens. The efforts have intensified after the world was shut down by the deadly Covid-19 virus. | The Brain Maze