LIGHT

   It’s a kind of energy called “electromagnetic (EM) radiation”. There are other kinds of EM radiation too (radio waves, microwaves, x-rays, etc.).Light travells very fast and straight about 186,000 miles per second [300,000 kilometers per second], so light from Continue reading

HUMAN EYE

                        The eye is about as big as a ping-pong ball and sits in a little hollow area  in the skull. The eyelid protects the front part of the eye. The lid helps keep the eye clean and moist by Continue reading