Today’s interesting fact has to do with lenses.

The purpose of a lens is to focus light.

Children often learn about this is science classes, but before that many children learn to burn holes in cardboard, leaves and wood.

The average lens children play with to burn things focus light up to 1000 times.

The lens of your eye is better at focusing light, and is 2.5 times more effective.

Because the lens of the eye focuses mainly on the fovea, this is why they tell you to not look at the sun.