Covid-19 pandemic struck the world, IIT-Bombay Professor Rajneesh Bhardwaj was studying how droplets evaporated for applications in spray cooling and inkjet printing, and his collaborator Amit Agarwal was working on point-of-care medical devices and electronic cooling.But once it became clear that the pandemic was mainly spreading through cough and sneeze aerosols from infected individuals, the duo began applying their knowledge to understand the evaporation of respiratory droplets from surfaces and the spread of cough clouds.Also Read | Investing during all-time highs can be good strategy"Our plans were to continue in the domain of thermal and fluid engineering.