Ending a period of "bad luck" for clover researchers, scientists report finding the gene that turns ordinary three-leaf clovers into the coveted four-leaf types. Masked by the three-leaf gene and ...

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 ...