Dr. Arturo Casadevall from Johns Hopkins School of Public Health talks about a potential fungal epidemic in his new book, "What if Fungi Win?"Then, what if there was one overarching theory that could help explain much of our modern-day daily lives? Science journalist Tom Chivers explores the concept of the predictability of everything, based on a theorem developed by Thomas Bayes, an 18th-century Presbyterian minister and statistician.