In Greek mythology, the chimera was a vicious beast born of the unholy union of the monsters Typhon and Echidna. With body parts liberally borrowed from goats, dragons, and lions, this mixed-up monster surely haunted the dreams of many a Grecian child, and has sparked the imaginations of countless storytellers since. The term has been picked up by the medical profession, however, and carries an even more sinister connotation. In what is the stuff of apocalyptic science fiction, modern scientists are experimenting with ways to combine human and animal genes. Often this is done for the purpose of stem-cell research, medical advances, and transplants. Often, however, the research ends with the creation of strange human/animal hybrids, or chimeras.