Mainstream astronomical theory before Galaxy Zoo held that elliptical (or 'early type') galaxies were red in color and spiral (or 'late type') galaxies were blue in color: several papers published as a result of Galaxy Zoo have proved otherwise. A population of blue ellipticals was found. These are galaxies which have changed their shape from spiral to oval, but still have young stars in them. Indeed, Galaxy Zoo came about through Schawinski's searching for blue elliptical galaxies, as near the end of 2006, he had spent most of his waking hours trying to find these rare galaxies. Blueness in galaxies means that new stars are forming. However ellipticals are almost always red, indicating that they are full of old and dead stars. Thus, blue ellipticals are paradoxical, but give clues to star-formation in different types of galaxies.