When dealing with light itself red, green, and blue create white.
What are the primary colors of paint (all three)
With things like paint, red, yellow, and blue create brown.
What are the primary colors of pigments (all three)
More correctly, the CMYK color model, 'K' meaning 'key', which is black. Pigments and dyes reflect light a little differently, so different primaries were found.
What device can split light into a pseudo-rainbow?
Water droplets can act as prisms, which is why rainbows are called rainbows.
How many colors are in a rainbow?
The color bands are an illusion created by human perception and different people may even see different bands. Also see: http://en.wikipedia.org/wiki/Rainbow#Spectrum
What is the shape of a rainbow?
Although the phenomenon we see is a ring, a rainbow is actually an irregular frustum (half-cone)
Are photons particles or waves?
Photons exhibit the behavior of both particles and waves.
Is it possible to slow down light?
Just as ocean waves and wind can travel at different velocities, light can also travel at slower-than-light speeds.
Is it possible to move something faster than the speed of light?
At 'the speed of math' a line can easily move faster than light. Mathmatical points and such are considered tethered to information exchange and therefore to the same laws of physics as anything else, but that doesn't quite remove the mathmatical reality of such propagations. Then again, mathmatics is often considered the physics of an alternate universe... weird stuff.