The story of humans trying to use light and heat to their benefit goes back to prehistoric times. The earliest use of fire for these purposes led to torches, oil lamps, candles, gas systems, and ...

University of Tennessee provides funding as a member of The Conversation US. When people name the most important inventions in history, light bulbs are usually on the list. They were much safer than ...

When people name the most important inventions in history, light bulbs are usually on the list. They were much safer than earlier light sources, and they made more activities, for both work and play, ...