BBC Earth

Episode 4 – Light

Preview

For 40,000 years, man’s only source of light comes from the sun and fire… then 150 years ago the switch is flicked on a light revolution.

Whether it was changing our genetic makeup, fundamentally altering the world’s sleeping patterns, transforming our architecture, taking us into space or triggering one of the great social reforms in American history, the pioneers of Light have made themselves indispensable throughout human history.