Why are letters reversed in a mirror? Try this experiment with pen and paper.
Research shows that marksmen shoot most accurately when their hearts' rhythm increases from eight to twenty beats per minute over their resting heart rate.
When we are in a fairly dark room, or outside at night away from lights, we can still see, but we can't see the colors of things very well. Why is that?
Did you know that the thaumatrope was invented by an English physician named J. A. Paris in 1926?
3D TV and movies seem to be all the rage but are they harmful to eyes?
Why does the corner of the room, where two walls and the ceiling meet seem to show two different wall colors?
When it comes to common eye myths, what is true and what is false?
Look in the mirror... do you see your eyes move? Learn about saccade.
One of the most impressive feats of muscular coordination in nature is the very common instance of a frog darting out its tongue in order to catch a fly.