If you ever feel alone, you shouldn’t, because you are actually surrounded by viruses. They’re in you, they’re on you and, in fact, there are more viruses in the world than there are stars in the sky. So why aren’t we sick all the time? In this episode Tai looks at how viruses work, how they travel, and the ways in which they shape our lives—both bad and good. This week Tai spoke with: - Seema Yasmin, physician, writer and science communicator based at Stanford University - Lena Ciric, environmental engineer and lecturer at University College London