Find out why some birds really do keep one eye open and how they do it.
Did you know that the thaumatrope was invented by an English physician named J. A. Paris in 1926?
Those tiny dots are actually blood cells moving in the retina of your eye.
These bouncing balls show you the path light would take when it reflects off the back of a real spoon (although light bounces into your eye, not out of it).
If your eyesight is good, you probably think everything you see is always in sharp focus, like a photograph; this isn't the case.
One of the loveliest sights an ornithologist runs across is the iridescent blue found in some birds’ plumage. Sure, cardinals have red feathers and finches have yellow feathers, but if you ever run across the gleaming, almost metallic-looking blue of an indigo bunting, you won’t forget it. The colors shimmer and shine like oil on water. Learn more on this Moment of Science.
Have you ever woken up to something gooey in the corners of your eyes? Why do we get eye crust when we’re asleep but not when we’re awake? Learn more on this Moment of Science.
Is squinting really that effective? Find out on this Moment of Science.
What is the autokinetic effect and how can you use it to fool your friends?