Planet Money


Business, News & Politics

Chart Positions

Top 200 20
Business 2

The economy, explained, with stories and surprises. Imagine you could call up a friend and say, "Meet me at the bar and tell me what's going on with the economy." Now imagine that's actually a fun evening. That's what we're going for at <em>Planet Money</em>. People seem to like it.


#534: The History of Light

April 26th, 2014

Episode 684 of 902 episodes

On today's show: How we got from dim little candles made out of cow fat, to as much light as we want at the flick of a switch.The history of light explains why the world today is what it is. It explains why we aren't all subsistence farmers, and why we can afford to have artists and massage therapists and plumbers. (And, yes, people who do radio stories about the history of light.)The history of light is the history of economic growth — of things getting faster, cheaper, and more efficient.