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Fact #1
Surfaces that best reflect light are surfaces that are shiny and smooth (like a mirror, or a glass wall). This is because light bounces off them more easily than surfaces that are dull and bumpy (like a brick wall).
Fact #2
When light bounces off a object our eyes see it and senses it, and when we see and object we see the color that it reflects.
Fact #3
Light first has to come from a light source and after that it reflects off an object and we can see the object.
Fact #4
when we look at a mirror it reflects  light that hits it  because it has a shiny face.
Source
http://www.bbc.co.uk/schools/scienceclips/ages/10_11/see_things.shtml

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Fact #1
A shadow is made when an object blocks light. The object must be opaque or translucent to make a shadow. A transparent object will not make any shadow, as light will pass straight through it.
Fact #2
The object must be opaque or translucent to make a shadow. A transparent object will not make any shadow, as light will pass straight through it.

Fact #3
Light is a form of energy which our sense of sight can detect. It is made of electro-magnetic radiation and travels in a straight path.
Fact #4
There are different colours of light because they are light waves which have different wavelengths. Red light has the longest wavelength while violet light has the shortest wavelength.

Source
http://www.kidsbuilder.com/FunFactsForKids/light.html

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Fact #1
Whenever a sound is made something vibrates for example when we talk our vocal cord vibrates.
Fact #2
Sound is louder when it is going trough a solid object.If your friend puts his or hers ear on  a metal poll and you speak on the poll it is louder in a poll than in air.
Fact #3
The pitch of a sound is how low the sound is or how high the sound is.Tuba has a low sound and a Flute has a high sound.
Fact #4
If you blow in a empty bottle it will make a low sound and if you fill a bottle up and blow in it the sound will be high.
Source
http://www.bbc.co.uk/schools/scienceclips/ages/9_10/changing_sounds.shtml

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Fact #1
Sound waves enter the outer ear and travel through a narrow passageway called the ear canal, which leads to the eardrum so we can here.

Fact #2
The auditory nerve carries this electrical signal to the brain, which turns it into a sound that we recognize and understand.

Fact #3
Our ears vibrate in a similar way to the original source of the vibration, allowing us to hear many different sounds.
Fact #4
The sound of thunder is produced by rapidly heated air surrounding lightning which expands faster than the speed of sound.
Source
http://www.sciencekids.co.nz/sciencefacts/sound.html