Rats have a strikingly different visual system than our own, one that is carefully attuned to their unique needs.
The box jelly has evolved a central nervous system unlike any other animal on Earth.
Vision may not involve creating an inner model of the world in the brain.
Have you ever been staring into space, or gazing up at a clear, blue sky and suddenly noticed clusters of tiny dots and swirls?
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?