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This is planet money from Nprdez light.
Its amazing, isnt it?
We have it at our fingertips with the flip of a switch or a button on our phones these days.
Its a technology so convenient, so ubiquitous, you almost forget its a thing.
But the ways humans have captured and used lights have evolved over the centuries.
And with each advancement, weve been able to work longer, travel farther, invent whole new industries.
You could even say that as the technology of light progresses, so does humanity.
Back in 2014, David Kestenbaum and Jacob Goldstein wanted to understand that exact correlation.
So they asked the question at different points in history, how much did light cost?
Here's Jacob.
Long before there were light bulbs, there was fat.
For thousands of years, if you wanted to light up your cave, your mud hut, or if you were really lucky, your castle, you had to find some fat, something to use for a wick, maybe some moss, maybe a piece of fabric, and you had to light it on fire.
This was not easy.
Even today, it's a hard way to get light.