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It may be a natural or artificial source that allows us to see and makes things visible.
 * Research Questions **
 * What is light? **

The Sun
 * What is our main source of natural light? **

Sun, Lightning, Camp Fires, Stars, Lava.
 * What are some other sources of natural light? **

Gas Ligtning, Light Bulbs, Torches, Oil Lamps, Lanterns, Oil Lamps, Candels.
 * List as many sources of artificial (man made) light as you can: **

Its value is 299,792,458 meters per second and is imposible to be seen traveling.
 * How fast does light travel? **

Sunlight takes just over 8 minutes to reach Earth.
 * How long does it take for sunlight to reach the Earth? **

Reflection is the reversal of an image like on a mirror, water etc. Refraction is the reversal of an image on a vertical plane.
 * What is the difference between reflection and refraction? **

Humphry Davy in 1800.
 * Who invented the first lightbulb? When? **

Mainly in straight lines.
 * Light travels in (curved/straight) lines? **