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The fastest thing in the universe is light!

Light is an important part of our lives- it's energy. The light from the sun brightens up our days. Light from electricity helps us see in the dark, watch TV, use our mobile phones, and play on our computers. Life without light would be pretty dull!

For a very long time, scientists weren't

exactly sure how light travelled. They

figured out that sound travelled in waves,

but light was more of a mystery. Some

thought that light also travelled in waves

(kind of like the waves a rock makes when

you throw it in a lake), but others thought

it moved in little particles. To imagine

particles, think of tiny specks of dust.

Scientists figured out that light bounces (opaque) off certain objects like walls,

but is able to pass through (transparent) other objects like windows. Light can

also be slowed down and bent to produce the colours of the rainbow. Finally,

scientists decided that light must travel in both waves and particles.