Is this a rare find or a common shamrock? Fact checked by Sarah Scott Reviewed by Mary Marlowe Leverette Both Irish shamrocks and four-leaf clovers evoke St. Patrick's Day and the green landscapes of ...

An optical illusion is a visual phenomenon where our perception of thinking about an image differs from objective reality. This image is seen as a patch of natural grass with a three-leaf clover.

March is a time when everyone could use a little extra luck. And four-leaf clovers may come in handy—but there's one thing to know before you run out onto your lawn in search of a lucky charm: ...