W hen you hop in your car to head to work, drop your kids off at school or make a Target run, how many traffic lights do you ...

In the eye are light receptors called cones and rods ... Some experts think it could be blue and yellow. Alexandra Horowitz — author of "Being a Dog" — told us that it's difficult to know ...

A green filter only transmits green light. It absorbs red light and blue light. If yellow light shines at a red filter, red light passes through the filter. This is because: yellow light is a ...

You can use a prism to split (or disperse) white light into a spectrum of colours: red, orange, yellow, green, blue, indigo and violet. Dispersed means that the colours are separated out.