Extra Life: A Short History of Living Longer Series 1 Explore this four-part series, which examines the science and medical innovations that conquered some of the world's deadliest diseases and doubled life expectancies for many across the globe. Set in the context of the COVID-19 crisis, this series explores the lessons learned from previous global pandemics — including smallpox, cholera, the Spanish flu and others — and reveals how scientists, doctors, self-experimenters and activists launched a public health revolution, saving millions of lives