Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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The light hitting the earth right now is 30 thousand years old.
163
The oldest glowing lightbulb was first switched on in 1901 and lives in fire stations in Livermore, CA. It is known as the Centennial Light.
118
Electric lights for trees were first used in 1895.
62
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
If aliens located 60-65 million light years away from us, looked at earth through a really powerful telescope today, they would see dinosaurs!
18