Solar power has been harnessed by civilisations since the days of the ancient Greeks, but it's now on the verge of being more important than ever. Tim Harford examines how much of a challenge it poses to the energy establishment, and what that could mean for the planet's future.
Despite being highly toxic, the roots of the cassava plant are a vital source of nutrition in many countries. They also shed light on the hidden social forces that support a modern economy.
Humanity's taming of fire may be where the story of economics really begins, some argue. Tim Harford explores how fire has shaped our world and our minds, and why it's still got some important lessons to teach us.
RFID: The tech you’ve never heard of – but use every day
Radio frequency identification - RFID - is the foundation on which many contactless technologies are built. But is it getting left behind amid the "internet of things"? Tim Harford argues its best days may still be to come.
In the mid-19th Century, a man named Rowland Hill got fed up with how Britain's postal service worked, and decided to come up with a new system of his own. It would go on to change the world.