0 a rounded glass container with a thin thread of metal inside that produces light when an electric current goes through it
1 a rounded glass container that produces light when an electric current is passed through it
Before the invention of the light bulb, you had to watch plays during the day when it was light outside.
Before the light bulb, people did not do much at night because it was dark.
Finally, in 1879, Thomas Edison invented a safe and easy way to use the electric light bulb.
If you look at a picture of our planet from space at night, you can see how the light bulb changed life on Earth.
Laser light does not spread out like natural light or light from a light bulb.
People used candles for light at night until the light bulb was invented.
