Colin Marshall talks to Tim Harford, also known as the Undercover Economist. He wrote the book of the same name as well as The Logic of Life and now Adapt: Why Success Always Starts with Failure. In this latest book, Harford examines the value of numerous small-scale experiments — numerous enough to try many different things, and small-scale enough to fail without serious consequence — in business, technology, medicine, finance, climate change, and even his own life and career.