When the Coronavirus pandemic struck Japan, with its densely populated cities and crowded trains, it was vital to know just how the virus could travel through the air, and what could be done to block it. Fugaku, the world's most powerful supercomputer, had just been completed, and the Japanese government reached out to Kobe University Professor Makoto Tsubokura and his team to develop simulations of how the virus can spread in different situations. Professor Tsubokura talks with us today about how his developed their simulations, the results they achieved (which were then used by health agencies to advise people on how to stay safe and what situations to avoid), and how Fugaku can be put to use in the future.